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The Range
Rifle & Shotgun Discussion
Cutting 16" barrel to 14.5" on AR-15
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<blockquote data-quote="Beercules" data-source="post: 1361755" data-attributes="member: 4713"><p>I think I mis-interpreted the M4 part of your previous post....</p><p></p><p>To Garand's point, your ammo selection will make a bigger difference in how 'well' your BDC works than the difference in a 14.5 or 16" barrel if that is your primary concern. The ballistics table I have floating around here shows the difference in trajectory between a 16" and 14.5" gun firing M855 to be within 1 MOA out to 500yds. Keep in mind that M855 is generally 2 or 3 MOA ammo at best, too!</p><p></p><p>I run a TA31F on a 20" gun, and M855 is basically dead on the BDC, M193 is almost as good, and everything else differs. As a result, I shoot those two loads 99.9% of the time. Wolf and other lower velocity stuff is no where near the BDC ranging by the way, so keep that in mind when you select ammo and start shooting.</p><p></p><p>With that being said, the fixed BDC does provide convenient reference points for holdover even if you aren't shooting the load it was designed for or the barrel length it was designed for. I have plopped my ACOG on a 11.5" SBR, with no change in zero, and within a few rounds been hitting steel at 500m.</p><p></p><p>All that to say...don't be too quick to chop your barrel or replace the upper for the sake of the ACOG...you will very, very likely never see the difference.</p></blockquote><p></p>
[QUOTE="Beercules, post: 1361755, member: 4713"] I think I mis-interpreted the M4 part of your previous post.... To Garand's point, your ammo selection will make a bigger difference in how 'well' your BDC works than the difference in a 14.5 or 16" barrel if that is your primary concern. The ballistics table I have floating around here shows the difference in trajectory between a 16" and 14.5" gun firing M855 to be within 1 MOA out to 500yds. Keep in mind that M855 is generally 2 or 3 MOA ammo at best, too! I run a TA31F on a 20" gun, and M855 is basically dead on the BDC, M193 is almost as good, and everything else differs. As a result, I shoot those two loads 99.9% of the time. Wolf and other lower velocity stuff is no where near the BDC ranging by the way, so keep that in mind when you select ammo and start shooting. With that being said, the fixed BDC does provide convenient reference points for holdover even if you aren't shooting the load it was designed for or the barrel length it was designed for. I have plopped my ACOG on a 11.5" SBR, with no change in zero, and within a few rounds been hitting steel at 500m. All that to say...don't be too quick to chop your barrel or replace the upper for the sake of the ACOG...you will very, very likely never see the difference. [/QUOTE]
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Cutting 16" barrel to 14.5" on AR-15
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