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Stone Axe Engineering Throat Erosion & Muzzle Wear Gauges |
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| Article by Mike Conroy |
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I have now been into my addiction of collecting
surplus rifles for about the last eight years. I
love www.surplusrifle.com and I have always found
the various articles here to be very helpful and
informative. I can tell that there is a camaraderie
amongst us all who collect C&R rifles. We are the
types that would rather sit all day at a range,
popping off hundreds of rounds of cheap 8mm with our
old warhorse Turkish Mauser than be envious of the
guy with a new Remington 700 bolt action.
Since I have started to collect C&R rifles, I, like
many others, have developed great interest in
collecting the U.S. issue battle rifles. I love the
M1 Garand, the
1903 Springfield, the
03A3, the
P-17,
and the
M1 Carbine. I like them so much that I own
them all. The main reason I am writing this article
is to convey to my fellow collectors some
information regarding a product that has been very
helpful to me, and it's very economical to purchase.
When we speak of the average M1 Garand, a lot of us
think of Saving Pvt. Ryan an the famous "ping" that
we hear when the enbloc clip is ejected. There are
many people that have purchased M1's over the years,
whether it being from the
Civilian Marksmanship Program (CMP), a private party or
at a gun show. When trying to find that great deal on
a 1903 Springfield everybody wants to start
out collecting by buying a decent shooter. I am the type of
guy that wants to be able to play with my new toy,
and I want the best shooter for a fair
price. Aside from looking at the barrel and
seeing if the stock looks nice, how does one really
know the quality of what he is buying? How do you know if you're
actually getting a really nice deal or buying an over
glorified tomato stake? In my opinion, the barrel of
the rifle is the most important feature. It is the
heart and soul of the weapon. Looks can be very
deceiving. I would rather have an ugly rifle with a
decent barrel than a great looking rifle with one
that is shot out. Solving this dilemma is easy
and hopefully this little tool can prevent you from
purchasing a real lemon of a rifle.
The tool that I am writing about is a gauge made by
Stone Axe Engineering. It is a "2 in 1" combo deal.
It measures the throat erosion and
also the muzzle wear on a US
issued, military surplus service rifle. To quote
directly from Stone Axe's web site,
"Stone Axe Engineering offers to you the
STONE AXE ENGINEERING ECONOMY GRADE THROAT
EROSION AND MUZZLE WEAR COMBO GAUGES. These
gauges are a lower cost alternative to the high cost
precision ordnance gauges. This one stainless steel
gauge measures Throat Erosion (TE) and Muzzle Wear (MW) both with one easy to use
gauge. Gauges are available for the 30-06 M1 Garand
rifles, M14/M1A 7.62 NATO/.308 Win rifles( will also
work on M1 Garands converted to 7.62 NATO/.308 Win.)
and 1903(03A3) Springfield rifles(30-06). One gauge
is required to measure TE on each type of rifle but
all will measure MW on any U.S. Military .30 cal.
Rifle. The accuracy of these gauges is .0005”(one
half thousandths inch). I have compared my gauges to
CMP and Ara-mor gages and they measure practically
the same (plus or minus ¼ to ½ TE or MW number -
.0005 tolerance) so you get readings that are
standardized. The accuracy of these gauges is more
than adequate for the hobbyist gun collector."
All of the other gauges that are made by other
competitors either measure only the
throat erosion or the muzzle wear, not both. These
gauges can be pricey to the average collector, so
many decide not to purchase them. Ara-mor gauges
cost about $60 and they do not read the muzzle wear.
So, one would have to spend more money to purchase a
separate gauge that does.
Now let me tell you a personal story that happened
to me about three months ago. I was at a local gun
show. I am the type that specifically sets out to
look for the various types of US issued battle
rifles that I collect, the Garand, the M1 Carbine,
the '03, the '03A3, and the P-17. While meandering
about the various tables, I saw an M1 Garand that
really caught my eye. I asked the dealer if I could
look at it further, and with some hesitation, he let
me. (The hesitation sent up a red flag with me.) I
looked it over and found it had a Winchester receiver with a
1947 SA barrel. I asked the dealer what the muzzle
wear and throat erosion measured. He looked at me as if
I have three eyes. (That sent up a second red
flag.) Then he answered that the barrel was in very
good condition and "was a great shooter." He allowed
me to handle the rifle and turned around to tend to
another customer.
Without any delay, I proceeded to take out my Stone
Axe gauge and I slid the tool into the chamber ever
so lightly. The gauge read that the throat erosion
was at a 7. On a scale of 1-10, with ten being the
worst, a 7 in my opinion is not acceptable. (Again,
another red flag.)Next, I placed the end of the
gauge into the muzzle to see how much wear there
was. It measured about 6.5. (This drew a final red
flag.) The dealer at first didn't see me doing these
measurements. As I mentioned, he was busy with
another customer and his back was to me. When he
turned around, he saw immediately what I was doing.
I could see that his face suddenly had some
frustration to it. He came over and asked me, "Just
what the hell are you doing?" I told him that I
measured the muzzle wear and the throat erosion of
the barrel that he claimed was in "very good
condition and was a good shooter." As it turned
out, the barrel on his "good shooter" had a muzzle
wear of "6" and it's throat erosion was at "7". I
then told him that his asking price of $850 was
outrageous. He didn't like to hear that and with
that, I walked away. On a scale of 1-10, with 10
being the worst, you can see were this barrel
measured up to. It was basically a "shot-out" tomato
stake.
My point? We all know that there are
unscrupulous dealers out there. We also know that
there are dealers and sellers who don't know what
these measurements mean. Even if the guy was
truthful and told me he didn't know what the wear on
the barrel was, my Stone Axe gauge helped me to
avoid buying a lemon of a rifle.
When I originally contacted Stone Axe Engineering, I
looked at their web site and I was instantly sold on
their product. I bought the gauge for the M1 Garand
and for the 1903 Springfield. As stated above, one
gage is required to measure throat erosion on each
type of rifle but all will measure muzzle wear on
any U.S. Military .30 cal. Rifle. Having these
gauges allows me to walk into a gun show, or even
the CMP North Store, with a lot more confidence
in knowing what I am buying. The cost of these
gauges is priced very reasonably and will pay for
themselves in s short while if you buy many rifles. Ordering and
shipping information is very simple. Since each type
of rifle requires a different gauge for
measuring throat erosion, (all will measure .30 cal.
muzzle wear) you must specify which gage you want
when ordering.
One other note; Are Stone Axe Gages hardened ? No, the were made unhardened to protect your rifles barrel. If a bolt accidentally slams shut on a gauge or a person forces a gage into a barrel its better to ruin a gage than a $200 rifle barrel. Stone Axe gages are hard enough for hundreds of test if used properly.
Styles and prices are as follows:
30-06 M1 Garand $47.50,
M14/M1A 7.62/.308 Win. ( will also measure TE and MW
on M1 Garands converted to 7.62/.308 Win.) $48.50
1903 (03A3) Springfield Rifles $49.50.
Prices include shipping by US mail.
The web site for Stone Axe Engineering is:
http://www.stoneaxeengineering.com/
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Pictured above are the three gauges
made by Stone Axe Engineering. Note the "lines" at the
end of each gauge. Those markings measure the muzzle
wear. |
| Article by Mike Conroy |







