The $100 side charge upper comes with a BCG, complete with a bolt. In the wife's 22 NOSGAR AR I'm using a LWRC 6.8 bolt in the BCA carrier.Rocket vapor I looked at the BCA upper and what a deal. But the fine print got me " works only with BCA gen 2 BCG." i have a bolt and carrier already.
It's a bargain if you don't mind a low end, CHEAP upper receiver. I wouldn't think of a BCA barrel or complete upper as a quality item though. Might work, might not.

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