What do I need?

Ok so I haven’t had time to put those parts in yet, but I’ve been looking at other things I need. Any recommendations for the upper? (Complete uppers seem to cost almost as much as a finished firearm!)

I think i want to go with the SBA3 brace. What else do I need?

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Are these any good? Aside from the BCG and charging handle would this finish the firearm or is there some other things I need?

My bad i linked the wrong one. That one has the BCG and Charging Handle. The one I was looking at buying is the same but without the BCG and CH