What Calibers fit in an AR-15 lower?
Without changing lower receivers, what calibers can fit in the AR-15 lower? I know .22LR and 9mm fit in it, but what else can it be converted to?
30 Remington AR (not sure if is officially released or not)
There are so many:
300 Whisper (300 Fireball)
5.45x39 (.21 Ghenghis )
Wow, that's awesome. Thank you for listing all of these. Sounds like the AR-15 lower is a highly adaptable "gun".
7.62 will not fit in a normal AR lower. I don't know why people keep saying it.
Are there AR-styled rifles that do shoot 7.62? Yes. But do they use the same lower as a normal 5.56 AR? No.
Last edited by SHIVAN; 04-13-10 at 14:30.