ACR Media and Info Thread

ACR bolt is marked with "Multi Cal". what type of rounds it will take pair with the appropriate barrels? Sorry for the noob question. New ACR owner here.

The multi-cal part never really shook out.

The bolt carrier is universal to all the calibers that ever came out for it.

The bolt itself can do anything based on the .223rem/5.56 case head. The other conversion from the factory were .300blk and .450 bushmaster.

The only other factory conversion was 6.8SPC which also required a new bolt to fit the large case head.

There was/is a company called Argonauts reInc that did 7.62x39 and 6.5 Grendel bolts which would also facilitate 50 beowulf on the ACR. Herron arms has done 450 bushmaster and even a 30AR conversions with a custom bolt for the ACR
 
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