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1/25/2018 7:38:29 AM
Posted: 9/6/2002 6:58:17 PM EST
I'm in the planning stages for my attempt at a pure precision AR. What do I gain, in useful performance, with a 24" barrel over a 20". Basic mental model is a fast twist rifle to shoot heavier bullets 69 gr. and up to say 77 gr. I figure a 1/8 stainless Oly, but will I gain effective range or a significant velocity advantage with the longer tube?

Link Posted: 9/7/2002 1:45:00 AM EST
Most precision AR15 target rifles have 24" or 26" barrels. However, the DCM rifles have 20" barrels. There is a velocity advantage to the longer barrel, but probably not an accuracy advantage. If you want to shoot heavy bullets, you'll want a 1/7-1/8 twist rate. 1/7.7 seems to be common as well.

If you see yourself humping around in the field, there is a distinct advantage to the shorter and lighter weight barrel. But if you're not, and don't plan to use the rifle in competition that requires a 20" barrel, 24" is a good choice.

BTW, I think guys are shooting out to 600 yards with 20" barrels, so the loss of 4" does not seem to cause a problem.
Link Posted: 9/7/2002 4:01:42 PM EST
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