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Article Published Date: 12/19/2007

 

Article by Jamie Mangrum
 

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I decided to write an article on the subject of the AR platform of rifle. The AR is not really a surplus rifle although you can purchase surplus Vietnam era kits on the market. I do feel however that the AR does fit in with Surplusrifle.com's overall mission and theme. I have found that most of us that collect surplus probably also own an AR and maybe even an AK. I get the same type of enjoyment out of shooting an AR that I do from shooting any of my surplus weaponry. They are a military style rifle based upon a military rifle that has seen action in many, many conflicts and wars.

Shooting an AR rifle in California is not an easy thing to do. All of my AR rifles are based upon a Vulcan Arms lower that has a ten round magazine that is secured in place by a pin or screw. To load the AR you have to pull out the rear take down pin and then pivot your upper forward allowing you access to load your magazine. Then you close up things and you are good to go. The lower used in this project is of this type.

A year ago I would never have called myself an AR man. I had one in my collection but that was it. I rarely shot it. I think after spending so much time off my feet while I was ill and seeing all of the ads for after market accessories, this peeked my interest and made me reconsider my opinion. I am still somewhat apprehensive about shooting a direct gas impingement weapon. Something about streaming hot dirty gas directly into the receiver kind of irks me. But I have found if you regularly clean the AR rifle and take care of it they shoot really well. I have even expanded my collection by adding a Bushmaster gas piston upper to my arsenal. I really like this idea as it greatly improves the AR platform in my opinion. 

I decided to build an AR sniper rifle. I got the idea from two different places. First, Ted Jeo, Mark Trope and I are friends and very rarely a day goes by that we do not exchange a couple emails about anything from firearms to just a joke. Ted kept on telling Mark and I about how he was building a high performance AR. He already had a lower and had ordered a trigger and upper to complete the package. To say the least Ted's project had me salivating. I had a an AR lower sitting in my gun safe without an upper. Heck, I already had a basis for a project.

This leads me to the second source for my article idea - myself. I have a few nice performance rifles, but after my bout with cancer I am not the most agile guy on the range and walking beyond 200 yards is an adventure in of itself. For the foreseeable future I am confined to shooting at shorter distances. My long distance performance rifles sit quietly in silicone sleeves in my safe waiting for a better day.

As a result I default to shooting a rifle that performs well at short distances. This means 100 yards or less. I also wanted something that did not produce a lot of recoil and was easy for me to handle and to shoot. An AR performance rifle fits this criteria. I was a happy man because I had justified to myself the expense of buying an upper, trigger, and other required accoutrements required to complete my project rifle. It is a medical expense for my recuperation.

Note: I have not tried this idea out on my wife because I know what she will say. "Well, since you are not shooting all of your high powered rifles as much as you did before then why do you need them? You should get rid of some."  That is a slippery slope I do not want to slide down.

I did my research on what I needed and decided upon a DPMS upper with one hell of a heavy stainless steel barrel, Chip McCormick Super Match trigger, Ergo Tactical grip, and a Badger Ordnance tactical latch so I could clear my scope when I pull back on the charging handle. To save a little money, well actually a lot of money I decided to use a scope I already owned and I chose a Leatherwood Hi-Lux Uni-Dial Scope 4-12x 50mm that I had mounted on my Remington 700 PSS rifle. I ordered everything and shortly afterwards things started to arrive on my doorstep. 

Please know that I am no way an expert with all things AR rifle. I am a tinkerer like you. I intended this article to show that an ordinary "Joe" or "Jamie" in my case can build something on a performance level with some expense and low to moderate mechanical skills. The instructions are not detailed to the "Nth" degree but a high level overview of what is involved to complete the project. 

Figure 1

The Project Parts

 

The Trigger

Figure 2

Chip McCormick Super Match Trigger Group AR-15 Small Pin .154" Curved Single Stage Matte
If you have looked at a Shotgun News or just about any gun magazine over the past few years you have probably seen ads for Chip McCormick's unique AR triggers. They are completely self contained units that are pre-adjusted at the factory. I wanted simple and these triggers are that. Basically all you do is pop out the two pins retaining your existing trigger parts, drop in the McCormick trigger, insert the two pins that are supplied and then tap on the c-clips that come in the package.

Manufacturer's Product Description

Chip McCormick Super Match Trigger Group AR-15 Small Pin .154" Curved Single Stage Matte

These completely self-contained trigger group assemblies are factory tuned for a super match grade trigger pull with minimum take-up and overtravel. The innovative design provides unprecedented control, ergonomics and consistency. Constructed of a stainless steel outer casing and steel internal parts for dependable operation. Pre-set trigger pull is 3 to 3-1/2 lbs. Trigger drops in, but may need to be function checked by a qualified gunsmith. May require minor fitting. Fits Small Pin (.154") AR-15 only.
Material:
  • Stainless steel housing
  • Steel trigger components

Finish: Silver

Features: Self-contained trigger group

Notes:

  • Pre-set trigger pull 3 to 3-1/2 lbs
  • Factory tuned for minimum take-up and over-travel
  • Drop-in assembly, two center pins included
Source of part: http://www.midwayusa.com
 

Figure 3

Figure 13 shows the instructions that came with the trigger I ordered.

 

Figure 4

Loosen the screw retaining your pistol grip. Some manufacturers use standard Philips head screws and some use hex head screws.
 

Figure 5

Once the screw is loosened, slowly remove the grip so as not to bend or lose the small safety selector detent spring.
 

Figure 6

Next carefully remove the safety selector detent.
 

Figure 7

Now remove the safety selector.
 

Figure 8

Remove the top trigger pin.
 

Figure 9

Remove the lower trigger pin.
 

Figure 10

Remove and bag the trigger parts.
 

Figure 11

Insert the Chip McCormick trigger assembly.
 

Figure 12

Insert the two supplied pins.
 

Figure 13

On the backside of the label it states that the pins may be a tap fit. This is a very, very true statement. I needed to really tap mine with some force to get them started. Once started though they went through with little force.
 

Figure 14

Figure 14 shows two of the supplied c-clips.
 

Figure 15

Snap on the supplied c-clips.
 

Figure 16

Install the safety selector and set it to the fire position.
 

Figure 17

Install the safety selector detent (flat side facing out).
 

Figure 18

Install the grip so as not to bend the small safety selector detent spring (pictured above in figure 18).
 

Figure 19

Tighten the grip screw.
 

Figure 20

Cycle the safety selector to make certain it is not binding. Do not dry fire the trigger while the upper receiver is not installed. When finished place selector in safe position.
 

The Upper

Figure 21

DPMS Upper Assembly AR-15 A3 Flattop Upper with Bolt Carrier Assembly 223 Remington 1 in 9" Twist 20" Bull Stainless Steel
DPMS makes great products. I have owned several over the years and have always been happy with the quality. With this rifle project I went with the 1 in 9 inch twist on the rifling which is what a lot of "off the shelf" 5.56/.223 ARs come with these days. Heavy barrels with a higher twist rate can be had for the AR. These barrels are designed to handle the heavier weight bullets for long range target, sniper, or varmint type shooting. I went with the 1 in 9 inch because I wanted to be able to shoot a wider range of ammo including military surplus.

Manufacturer's Product Description

DPMS Upper Assembly AR-15 A3 Flattop Upper with Bolt Carrier Assembly 223 Remington 1 in 9" Twist 20" Bull Stainless Steel

This A3 Upper Assembly comes complete with bolt carrier assembly. The Flattop design is perfect for adding a scope, red dot sight or other optic device. Barrel has a crowned muzzle and does not include a bayonet lug.
Materials:
  • SST Barrel
  • Aluminum upper receiver

Finish:

  • Anodized Black

Notes:

  • Bayonet Lug Not Included
  • Crowned Muzzle
  • Gas block has one Picatinny rail on the top
  • Includes sling swivel
  • Button Rifled
  • Right Hand Twist
  • Ready to Install
  • Bolt Carrier Assembly Included
Source of part: Either http://www.midwayusa.com or http://www.dpmsinc.com/
 

Figure 22

Push outwards the front pivot pin and the rear take down pin.
 

Figure 23

Join the front of the upper and lower receivers. Push in the pivot pin till it locks.
 

Figure 24

Pivot the upper receiver down and push in the take down pin till it locks.
 

Figure 25

Pull back on the charging handle to make certain nothing binds.
 

Figure 26

Depress upper part of bolt catch so the bolt moves forward.
 

Testing the Trigger

Figure 27

Make certain the rifle is not loaded and point in a safe direction.  Place the safety selector into the fire position.
 

Figure 28

I used my trigger scale to test the trigger pull.
 

Figure 29

 3.5 lbs trigger pull
I was unable to achieve a 3.5 lbs trigger pull but had a consistent 4.5 lbs every single time I tested. Actually this is preferable to me. I later read that Chip McCormick triggers sometimes also come in 4.5 lbs configurations as well. I think this is what I ended up with.

Additional testing: With the rifle cocked I placed the safety selector in the safe position and tested the trigger. I could not pull the trigger. I repeated this test 5 times with the same results. I then placed the safety selector in the fire position and pulled the trigger. I then recocked the rifle by pulling back on the charging handle and then depressed the bolt catch. Each time the trigger functioned properly. I then placed the safety selector on safe while the rifle was cocked and let the buttstock of the rifle drop 3 to 4 inches to the floor. I did this five times and the safety held in place and the trigger did not function. I repeated this test with the safety selector in the fire position and the trigger did not function.  

The Latch

Figure 30

Badger Ordnance Tactical Charging Handle Latch AR-15 Matte
 

Manufacturer's Product Description

Badger Ordnance Tactical Charging Handle Latch AR-15 Matte

This oversized steel charging latch allows easier operation of the charging handle from a shooting position. Easily installed on your existing handle.
Source of part: Either http://www.midwayusa.com or http://www.dpmsinc.com/
I discovered that with my scope installed or any optic sight that sits to the rear of the flat top rail it is very difficult to operate the charging handle. I had wanted to try out one of the tactical latches for some time so I figured this was the project to do just that.

Figure 31

Pull or push the take down pin so the upper receiver can be pivoted forward.
 

Figure 32

Remove the bolt and carrier.
 

Figure 33

Remove the charging handle.
 

Figure 34

Drive out the roll pin that retains the original charging handle latch.
 

Figure 35

Figure 35 shows the roll pin and charging handle latch. What is not show is the spring still inside the charging handle that applies pressure against the charging handle latch.
 

Figure 36

Insert the new charging handle latch.
 

Figure 37

You can see the compressed spring in figure 37. I placed a punch inside the hole of the charging handle and the latch to hold it in place. I then inserted the roll pin until it held the charging handle latch and pushed the punch out.
 

Figure 38

Tap in the roll pin the remainder of the way.
 

Figure 39

Insert the charging handle into the upper receiver.
 

Figure 40

Insert the bolt and carrier into the upper receiver.
 

Figure 41

I then tested the new charging handle latch several times to make sure it was functioning properly.
 

The Optics

Figure 42

Leatherwood Hi-Lux Uni-Dial Scope 4-12x 50mm Adjustable Objective Mil-Dot Reticule Matte
 

Manufacturer's Product Description

Leatherwood Hi-Lux Uni-Dial Scope 4-12x 50mm Adjustable Objective Mil-Dot Reticule Matte

For extreme accuracy, trust a Uni-Dial scope. These scopes feature 10 numbered flags that allow the shooter to set a range of zero points for different ranges and loads. Additional features include a vertical adjustment dial and 1/4 MOA clock adjustments for windage. Features Leatherwood's DiamondTuff matte finish and a Limited Lifetime Warranty.
Scope no longer manufactured but Leatherwood tactical scopes can be found at http://www.midwayusa.com
 

Figure 43

Leatherwood Hi-Lux 30mm Max-Tac Tactical Picatinny-Style Rings with 1" Inserts Medium-High Matte
 

Manufacturer's Product Description

Leatherwood Hi-Lux 30mm Max-Tac Tactical Picatinny-Style Rings with 1" Inserts Medium-High Matte

These 30mm rings are constructed from solid steel bar stock and feature inserts for mounting scopes with a 1" tube diameter. For use with Picatinny-style bases.
Source of part: http://www.midwayusa.com
A good tactical scope and rings will cost you $400 and up. The set I used for this article cost me just under $500. I was not using the scope and rings on my Remington 700 so I decided to temporarily save some money on this project and reuse them. 

Figure 44

Figure 44 shows my Leatherwood tactical scope and rings.

Figure 45

I placed the scope on the rail and set it forward so i had proper eye relief. I then tightened down the rings.

Figure 46

The new tactical charging latch handle is of great use with the scope installed.
 

The "Almost" Completed Project

Figure 47

This is my almost finished project. I still have a new Ergo Tactical grip I ordered on the way but I have enough of the components put together to take it to the range and start to break-in the barrel and sight in the scope.

Year 2007 Totals for project:

  • $454 for the scope and rings
  • $460+ for DMPS Upper
  • $189 for drop in Chip McCormick Trigger
  • $20 for Badger Ordnance Tactical Latch
  • $37 for Ergo Tactical Grip
  • $133 for replacement and correct scope rings
  • Harris Bipod $65 (Note: I already owned several of the bipods and since the installation is so easy I did not cover it in the article.)

Total: $1321

For those of you wondering why I titled this section "Year 2007 Totals for project" - the reason is I will undoubtedly get angry emails two years from now because the prices went up or the item is no longer available. This is also the reason we now have "Article Published Date:" at the top of all of our new articles.

 

Additional Sight Choices

With the DPMS upper I ordered with the receiver rail and rail on the gas block I have other sight choices available to me other than just a standard tactical scope. Below I have some options on display to further explain this.

Figure 48

Figure 48 shows a Yankee Hill Machine detachable front AR sight for a picatinny railed gas block.
Source of part: http://www.dpmsinc.com/
 

Figure 49

Figure 49 shows a detachable rear handle with traditional AR rear sights.
Source of part: Either http://www.midwayusa.com or http://www.dpmsinc.com/
 

Figure 50

With both the detachable front sight and detachable rear handle installed the rifle take on a more traditional profile. This is a great backup combo sighting system to a scope.
 

Figure 51

Another of many rear sighting options is a detachable non-popup rear sight made by DPMS.
Source of part: Either http://www.midwayusa.com or http://www.dpmsinc.com/
 

Figure 52

Figure 52 shows an AimPoint CompML2 red dot scope installed on the upper receiver's rail.
Source of part: Either http://www.midwayusa.com or http://www.dpmsinc.com/
 

The First Range Report

Figure 53

My new rifle at the range ready to be broken-in and sighted in.
Like any person with a new toy I could not wait for everything to arrive and since I had everything except for the grip I decided to take off on a sunny day to the range and shoot the first of several visits covered in my range report.

 

Figure 54

Welcome to California! This is how you load an AR in California. You push out the takedown pin and then load the fixed 10 round magazine from the top. Then you close things up and shoot.
 

Figure 55

A close-up of my loaded and fixed 10 round magazine.
 

Why is the Break-in & Cleaning process important when first shooting through a new barrel?

When your barrel is chambered, by necessity there are reamer marks left in the throat that are across the lands, i.e. across the direction of the bullet travel. In a new barrel they are very distinct; much like the teeth on a very fine file. When the bullet is forced into the throat, copper dust is released into the gas which at this temperature and pressure is actually a plasma. The copper dust is vaporized in this gas and is carried down the barrel. As the gas expands and cools, the copper comes out of suspension and is deposited in the bore. This makes it appear as if the source of the fouling is the bore when it is actually for the most part the new throat. If this copper is allowed to stay in the bore, and subsequent bullets and deposits are fired over it; copper which adheres well to itself, will build up quickly and may be difficult to remove later. If this copper is allowed to stay in the bore, and subsequent bullets and deposits are fired over it; copper which adheres well to itself, will build up quickly and may be difficult to remove later. So when we break in a barrel, our goal is to get the throat polished without allowing copper to build up in the bore. This is the reasoning for the "fire-one-shot-and-clean" procedure.
Source: Krieger Barrels, Inc.
 
For barrel break-in I took along a solid cleaning rod, a new .223 brush & jag, .22 cal patches as well as an ample supply of bore solvent.

Step 1) I fired a single shot followed by a thorough cleaning. I repeated this process five times. The instructions state that if the fouling is still prevalent then you would want to repeat this "one shot and then clean" process another five times or until the fouling was minimal after shooting. After I completed my five "shoot and clean" steps I started to see a reduction in the amount of fouling I found in my barrel so I continued onto the next step in the process.

Step 2) I then fired a three shot group followed by a thorough cleaning.

Step 3) Then I fired a five shot group followed by a thorough cleaning. I could not see a lot of fouling at this point so I moved onto regular shooting.

This is not intended to be a comprehensive set of instructions for breaking-in a new barrel. Your barrel may take less or more steps until it is broken-in properly than my barrel did. I really just wanted to point out the importance of taking the time to properly break-in any newly installed rifle barrel.

I discovered my scope rings were too low. They were medium high rings. The scope cleared everything but I had to have the cheek hold from hell to get a good sight picture with the scope. It was very uncomfortable to shoot for long periods of time. I decided that as soon as I got home I would order a new set of "High" rings (figure 59) to replace out what I had initially installed.

Figure 56

Figure 56 shows a ten shot grouping using Wolf Military Classic Ammunition 223 Remington 55 Grain Full Metal Jacket ammunition after my barrel break in steps.
 

Figure 57

After shooting about 40 rounds of the Wolf ammo my groups started to tighten in figure 57.
 

Figure 58

Figure 58 shows the typical grouping I achieved at 100 yards using Remington Premier Match 69 grain Matchking BTHP ammunition. Pricey stuff but worth the expense.  I believe with higher scope rings and time I can do much, much better.
After initial break-in of the barrel and using high performance ammunition I started to achieve groups that I would expect out of this type of rifle setup.

The trigger is excellent and breaks like a dream. I am really pleased with its performance. The rifle is front heavy and if I were not using a Harris bipod mounted on my front swivel this would be an issue. I have seen a lead weight made just for for this purpose that is inserted in the access door of the AR butt stock. Honestly though the last thing I needed or wanted was to add additional weight to my already heavy rifle.

 

Part Two - Ergo Grips and New Rings

 

Figure 59

Leupold 1" Mark 4 Picatinny-Style Rings Matte Super High
Source of part: http://www.midwayusa.com
As planned I went home and tried to order the taller Leatherwood rings for my scope but found they were hopelessly on back order everywhere I tried. Being a patient man I immediately found a suitable substitute and ordered them so they would get here post haste so I could have a second range day before I rolled out this article. I ordered a comparable or better set of Leupold rings (figure 59) that are much taller and should alleviate my uncomfortable cheek weld I experienced during my first shooting session.

The grips arrived so I set about replacing them.

 

Figure 60

Ergo Deluxe Tactical Grip

Source of part: http://www.tngunparts.com
 

Figure 61

Ergo Deluxe Tactical Grip

Source of part: http://www.tngunparts.com
 

Figure 62

Loosen and remove the grip screw. Once the screw is loosened, slowly remove the grip so as not to bend or lose the small safety selector detent spring. Make sure the safety selector detent does not fall out of the lower receiver while you work.
 
 

Figure 63

Remove the small safety selector detent spring.
 
 

Figure 64

Insert the grip screw into the new Ergo grip.
 
 

Figure 65

Insert the small safety selector detent spring.
 
 

Figure 66

Make sure the safety selector detent did not fall out and it has the flat side facing out. Make sure the safety selector is set to the fire position. Install the grip so as not to bend the small safety selector detent spring.
 
 

Figure 67

Tighten the grip screw.
 
 

Figure 68

Cycle the safety selector to make certain it is not binding.
 
 

Figure 69

Side view of the new installed Ergo Tactical grip. I really like the feel of the grip. It is covered with a rubber hide that makes it very easy to grip. I also like the overall shape and size of the grip. It is an excellent fit for my hand.
 
 

Figure 70

Now it is finished!!!

 
I installed the final two additions to my rifle. I added the Ergo Deluxe Tactical grip and my Super High Leopold Rings. I am a happy camper. My cheek weld is perfect and the sight picture with the scope is also perfect. I am really excited about heading back out to the range!
 

Back to the Range!

Actually I went back to the range two more times. The first time it was raining and cold. Every single time I would put my eye up to the scope my eye glass lens would fog over and obscure the target. I got off some shots (around ten) once I trained myself to either hold my breath or breath only through my mouth. I was the only person at the range that day. The range officer called me "hardy" for daring to come out and shoot on such a day. My wife said that translates to "stupid."  I finally got discouraged and packed up vowing to return another day.

Figure 71

Picture of the range the first day I returned. Note no one else shooting.
 
 

Figure 72

My ten shots. Not a pretty grouping for such a high performance rifle. The weather beat me! I rarely could make out the target through the fog on my glasses.
 
Finally I returned to the range for a third shooting session. It was sprinkling but not a downpour like my last visit. The temperature was also warmer. This was the key because my eye glasses were not fogging over and I could see the target.

This was it! The rifle was complete! Everything had come together and I was going to shoot the final product of my labor. Kind of like preparing the perfect romantic dinner I purchased another box of the Remington Premier Match 69 grain Matchking BTHP ammunition. I figured I wanted to feed her the best I could.

The new scope rings were exactly the height I needed to get a good scope picture of the target. The grip felt excellent in my hand. I have to admit that I was skeptical about the grip at first. My theory was how much better could it really be?  I discovered it was a huge improvement over the mil-spec grip. It has a rubbery surface that makes it comfortable to hold while shooting and I really like the finger grooves.

I set up my targets at 100 yards and I fired off my first five shots. I smiled at what I saw in my spotting scope (figure 73). It all paid off. Although I am not the greatest shooter in the world I had built a rifle that would even the playing field somewhat. The combination of the scope, upper, trigger, and grip made a shooting platform that help me perform at my best. 

After tweaking the scope a few clicks to the right I loaded up ten rounds and slowly fired off each round (figure 74).

Figure 73

My first target of five shots of the day. Made me smile.
 
 

Figure 74

My second volley of ten shots.
 
I was not an AR man at one time. Do I consider myself one now? Well, I will take my new creation to the range time and time again. I will probably get great enjoyment from it for years to come if I take care of it. It is more accurate on so many levels than I am capable of shooting. The ammo is reasonable priced and easy to find. I like the looks of the rifle and I can always find something on the market to change or improve upon its performance. This fact alone keeps my attention and my enjoyment factor going for some time to come.

So I guess the answer is yes. I am an AR man.

 
 

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