Just as the title states. It's a simillar question to what was asked this morning by another member.

 

I have a CMMG lower marked "Multi". Other than 223/556, which other caliber uppers will fit this type of lower?

300 blackout

7.62 x 40 Wilson Tactical

7.62x39

22 LR

5.7 FN (kinda)

6.8

6.5

9mm

40

45

7.62x25 tokarev

450 bushmaster

50 beowulf

458 socom

 

and many more

Forgot 5.45x39

50BMG

Just about all of them.

50BMG

 

Not to thread-jack, but if you put a single-shot 50 BMG upper on an AR lower, does it still meet the definition of a semi-auto rifle with detachable magazine, or do the evil features cease to apply (i.e. collapsible stock)?

it would be a bolt-action or single-shot.

Thanks for the replies. Of all of the calibers that are offered, I have only been researching 556/223. The thought never popped into my head that all those uppers would fit a single AR lower. So.....great.. My choices have now expanded a tad.

10mm

6mmx45

6mm AR-p

6mm ppc

.264 lbc

.410 upper if you can dig one up.

 

 

And don't forget the crossbow upper and black powder upper.

 

And don't tell anyone, but they'll fit whatever ar-15 lower you have even if they DON'T say multi.

 

And don't forget the crossbow upper and black powder upper.

 

 

Wow...just googled the crossbow upper.

damn that's pricey!

I think only a .308 won't work.

I think only a .308 won't work.

 

There's a heck of a lot more calibers than .308 that won't work. Even without going for something I can't get in an ar-10 either, there's 6.5 creedmore, .243, .260 remington, 7mm-08, .444 marlin, .284 win, .35 rem, .300 savage, .450 marlin, etc.