Barrel Profiles
Colt 6520
http://www.box.net/shared/static/ld80rvpbe2.jpg
Novekse “Skinny”
https://app.box.com/shared/static/w3...64u3sg3jgv.jpg
Centurion Arms “light weight”
http://www.box.net/shared/static/qiroxvm32d.jpg
Colt 6920
http://www.box.net/shared/static/q241k2povu.jpg
Bravo Company BFH
https://app.box.com/shared/static/gs...dcq6ji0y7d.jpg
Noveske N4
http://www.box.net/shared/static/hhvmdvg94f.jpg
Colt 6721
https://app.box.com/shared/static/3bnl8bdr23.jpg
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Accuracy Evaluation of a Bravo Company 14.5” Barrel
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The focus of this article is the cold hammer forged (BFH) version of Bravo Company’s 14.5” barrel with a mid-length gas system. As can be seen in the pic above, this barrel has a government profile. This is a chrome-lined, NATO chambered barrel with a 1:7” twist. Bravo Company states that these barrels have been high-pressure/magnetic particle tested according to the current mil-spec.
I conducted an accuracy (technically, precision) evaluation of the Bravo Company 14.5” BFH mid-length barrel following my usual protocol. This accuracy evaluation used statistically significant shot-group sizes and every single shot in a fired group was included in the measurements. There was absolutely no use of any Group Reduction Techniques (e.g. fliers, target movement, Butterfly Shots).
The shooting set-up will be described in detail below. As many of the significant variables as was practicable were controlled for. Pictures of shot-groups are posted for documentation.
All shooting was conducted from a concrete bench-rest from a distance of 100 yards (confirmed with a laser rangefinder.) The Bravo Company 14.5” barrel used in this evaluation was free-floated during testing using a Daniel Defense Omega free-float railed handguard. The free-float handguard of the rifle rested in a Sinclair Windage Benchrest, while the stock of the rifle rested in a Protektor bunny-ear rear bag. Sighting was accomplished via a Leupold VARI-X III set at 25X magnification and adjusted to be parallax-free at 100 yards. A mirage shade was attached to the objective-bell of the scope. Wind conditions on the shooting range were continuously monitored using a Wind Probe. The set-up was very similar to that pictured below.
https://app.box.com/shared/static/xo4duzdgtp.jpg
https://app.box.com/shared/static/lkg47ptc04.jpg
For this evaluation, I used one of my standard match-grade hand-loads topped with Sierra 55 grain BlitzKings. When fired from my Krieger barreled AR-15s, this load has produced ˝ MOA 10-shot groups at 100 yards.
https://app.box.com/shared/static/n5...y2inihdvzq.jpg
Three, 10-shot groups were fired in a row from the Bravo Company 14.5” barrel from a distance of 100 yards with the resulting extreme spreads:
1.58”
1.96”
1.50”
for an average 10-shot group extreme spread of 1.68”. The three, 10-shot groups were over-layed on each other using
RSI Shooting Lab to form a 30-shot composite group. The mean radius of the 30-shot composite group was 0.49”
The smallest 10-shot group . . .
https://app.box.com/shared/static/v1...kxxo1why9o.jpg
The 30-shot composite group . . .
https://app.box.com/shared/static/ff...kdlc7ncuwm.jpg
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Noveske 14.5” N4 Light Barrel
http://www.box.net/shared/static/if9xfp9b6u.jpg
The 14.5” N4 barrel was tested in the same manner as described above. Three 10-shot groups fired from 100 yards using match grade hand-loads had extreme spreads of:
1.029”
1.360”
1.275”
for a 10-shot group average of 1.22”. As above, I over-layed the three 10-shot groups on each other using RSI Shooting lab to form a 30-shot composite group. The mean radius for that composite group was 0.37”.
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