I'd recommend the CMMG with fwd assist -
1) it is truly an AR (you could interchange the upper / lower with another AR)
2) might as well have and learn the true AR control system, fwd assist is part of the deal
3) even though I have yet to own a CMMG anything, I have a funny feeling that they make a great product, will stand behind it, and will steer you in the right direction if you give them the opportunity
4) go with the last shot hold open. That is how an AR really works - might as well do this right
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