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what makes an XCR rock and roll???

1K views 1 reply 2 participants last post by  MrSmitty 
#1 ·
So, I am just curious what is the difference between the class three milspec XCR and the civilian version? Most of us know the inside of the AR15 and 16 enough to know… but I am wondering what is the changes involved with the XCR. Not that I would do it, but always interesting from a mechanical stand point…
 
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