My prob is defining verticle center mass, need some shaded depth in an aperture. Should help with finer front sight focus, i got a decent ballastic advantage performance line m4 profile 16 inch barrel, its actually stringing 10shots a little over 2 moa verticle and 1.5 moa horizontal for a group with fed xm855 ammo which is probably maxed out performance wisr for that ammo.
