DPMS if you are in a hurry.
Order upper and other parts separate from the best source if you have time.
RRA
STAG
DPMS
All of these parts are MILSPEC. So, they work together right.
My favorite 9mm AR uses an RRA upper with DPMS internals and rear stock with a STAG lower receiver. Put at least 1000 rounds of various through it with NO problems.
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