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**Cole125** · 09-30-2012, 14:58

I would consider a 20 inch barrel, medium or heavy profile for a long range AR15 setup. I have a Rock River Arms Varmint 20 bull barrel upper on my SPR build, and it will group ANY ammo that will fit into the magazine less than an inch at 100 yards.

09-30-2012, 14:58	#6
Cole125 Silver Membership Senior Member Join Date: Apr 2008 Location: Far West, USA Posts: 7,167	I would consider a 20 inch barrel, medium or heavy profile for a long range AR15 setup. I have a Rock River Arms Varmint 20 bull barrel upper on my SPR build, and it will group ANY ammo that will fit into the magazine less than an inch at 100 yards.