Flynt
Member
I'm trying to mate a RRA 5.56 uppper (16.25" 1:9 barrel, free floating hand guard) with a Bushmaster lower. I'm getting poor groups, 2-4 inches @ 100 yds. depending on make of ammo. I notice that there is some play in the mating of the the upper and lower. I can hold one in one hand and the other in the other hand and twist -- and feel a tiny bit of rotation. Could this affect accuracy? Thanks.