American Rifleman - July 2011 - 34

TECHNICAL

QUESTIONS & ANSWERS

AR-15 Barrel Life

Q

I have a Colt Match Target AR-15 in
5.56x45 mm NATO, and I shoot targets at
100 to 200 yds. I try to shoot at a moderate pace
and clean it carefully using only the best equipment.
My question is, about how many rounds are these barrels good for?

A

It's the only revolver that
shoots through the
bottom chamber!
* 100% precision machined parts
* Natural feel, ergonomic grip
* Loaded chamber indicator
* Centerline point of aim
* Flat sided
cylinder
* .357 Mag

Generally, the throat of a barrel on a .223 Rem. or 5.56x45 mm
NATO rifl e will erode at a rate of about 0.100" per thousand
rounds. Some barrels will erode faster, and others will erode
more slowly. It is this erosion that most shooters are concerned
about when discussing barrel life. Many shooters will assume
that the barrel must be replaced once you have between 0.700"
and 0.900" erosion.
In some cases, that is correct, as accuracy will tend to drop off
once that point is reached. I have seen barrels with their throats
eroded one-half to two-thirds their length, however, that still shot
incredibly tight groups. In the final analysis, only by measuring
the groups you are getting at the range can you determine when
a barrel should be replaced. When those groups open up to the
point where they are no longer acceptable to you, then the barrel
should be replaced regardless of the number of rounds that have
been fired.
-REID COFFIELD

Winchester Model 1885 Ejection

Q

Some years ago I acquired a new-production Model 1885 Winchester
Low Wall chambered for .22 Long Rifle. It is well-made, beautifully
finished and shoots great, but for some reason it will not kick the spent
shells out of the chamber. I have to pick them out by hand. Is this
normal? Also, can you tell me something about the gun?

A

Your copy of the 1885 Browning Low Wall rifle was produced
and sold under both the Browning Arms Co. and U.S. Repeating Arms Co. names. Miroku in Japan produced both variants. The Browning version was introduced around 1995
while the U.S. Repeating Arms version was introduced
around 1999. Only a limited number were produced. I
believe U.S. Repeating Arms sold about 2,400 Low Wall
reproductions.
As for the ejection of the fired case, the Low Wall copies
were produced with an extractor, but not an ejector. While
the High Walls had an ejector that would throw the fired
case out of the action, the Low Wall would only push the
case partially out of the chamber. It would then have to be
manually removed. Historically, this is characteristic of the
original Low Walls.
-REID COFFIELD

www.mkschiappa.com


http://www.mkschiappa.com

American Rifleman - July 2011

Table of Contents for the Digital Edition of American Rifleman - July 2011

American Rifleman - July 2011 - 1
American Rifleman - July 2011 - 2
American Rifleman - July 2011 - 3
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