AR caliber question

[al g blenny]

I am going to be doing an 80% build. What are my caliber options? Do I have to build the lower with a specific intended caliber in mind? Can I build a standard lower and have multiple options? I was really wanting to go with something bigger than .223 with one build and I also want to do a .22LR with the other.

[tomd1584]

A standard lower can accept magazines for .22lr, 6.8apc, 7.62x39, 9mm, .50 beowolf, 5.45x39, 6.5 grendel (maybe?) and others I cant even remember right now. Just build it to standard lower specs and you should be good to go!

[BillyGoatMachine]

If your going to engrave your info in the lower, Just put MULTI CAL on the sucker and build it for any caliber that fits in the magwell. Or get a bolt action upper and stick a .510 DTC on it for some real fun.

[tomd1584]

If your going to engrave your info in the lower, Just put MULTI CAL on the sucker and build it for any caliber that fits in the magwell. Or get a bolt action upper and stick a .510 DTC on it for some real fun.

you can put multi-cal on your lower if you want to, but the engravings have no impact on what kind of upper you're allowed to put on.

I agree with SKKEETER, put a .510 DTC on!

[al g blenny]

Thanks everyone. That was just the info I was looking for.

[fonionrings]

Lowers are lowers. The caliber markings don't mean anything. Period.

As long as the firearm is configured to be legal, the lower can be marked "Thermonuclear unicorn-killer, Cal 70mm"