[Mordecai]

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)?

 

[Clayton]

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

 

[robocop10mm]

barrel length

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

 

[Catfish]

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.