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What are the differences in groupings between say a 16" barrel and a 20" barrel at approximately 100 and 200 yards (on an Ar-15)?
 

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What are the differences in groupings between say a 16" barrel and a 20" barrel at approximately 100 and 200 yards (on an Ar-15)?

At those distances, I would say the 16" and the 20" would perform the same. I don't think you would notice much untill you pushed out past 300yds or more.

Steve
 

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barrel length

My 16" carbine shoots 3/4" at 100. My 20 HBAR shoots 1/2" at 100. Not much difference.
 

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Barrel lenth as no effect on accuracy, is the quality of the barrel. The difference between is shot barrel and the long barrel would be acouple of 100`s fps., or 10 to 15 yrds. on max. point blank range.
 
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