The AR-15
Was shooting an AR yesterday trying to sight-in a set of magpul BUS.
Shooting 55 gr hornady loaded with 25.5 gr Varget in a 20" 1:9 barrel, RRA A4 Flat top Upper with the picatinny gas block.
First 3 shots were way, way, WAY high (~8-10") so i cranked up the front sight post.. Long story...