AR15 in 45ACP?

[ssblair]

Olympic Arms makes one of these, which I was thinking about for making an AR "SMG" carbine with a slidefire stock so I can avoid the class 3 business.

Anyhow, I have heard of case heads on 7.62x39 being so large as to create strength/durability issues in AR15 size bolts, and I can't imagine that the 45ACP case head is any smaller, so I am wondering if anybody knows if the Olympic 45ACP upper has the same issues as the 7.62x39 are reputed to have, or if the uppers have any problems in general?

I believe that 40S&W or 10mm would theoretically make a more capable carbine/SMG, but I want to stick with a caliber that I already use.

 

[fireball168]

The Olympic Arms 45 ACP uppers are blowback operated, they do not have a "conventional" DI bolt/bolt carrier assembly.

The only thing that you are going to break on one of those uppers, maybe, is the ejector spring.

Ron Williams builds 45 ACP DI uppers, but I haven't heard him say anything about bolt breakage - likely due to the comparatively low operating pressure.

 

[wagyu52]

Right here in Indiana, been drooling over one of these for a long time know.
Bazooka Brothers Mfg.

 

[MJ06IU]

Would you consider a Bushmaster upper? I've seen them at PSS(Plainfield Shootng Suppiles). Personally I trust BM more than Olympic...just me though.

 

[ssblair]

I don't have anything against Bushmaster, but I thought Bushmaster made uppers in .450 Bushmaster, not 45AUTO?