I am trying to take maximum advantage of the fact that you can just swap uppers on an AR15 and have a whole different animal. Ive got the standard 5.56 setup but I aint sure which would be a wise choice for another upper of a different caliber for the occasional 1000yd shot or when more penetration/power is needed, I know at a certain point that it would turn into a "bolt gun" because of magazine size, Ive even found 50bmg single shot uppers that will pin up, but Im not sure if those would be a good idea or not. Anybody here have a "Do-All" AR15 that there getting good service out of?
MUCH OBLIGED
MUCH OBLIGED