For sale is a complete upper. Aero Upper reciever, w/ PSA MPI BCG and Charging Handle. 16* M4 5.56 1/8 barrel, 14* keymod handguard. Had a different muzzle brake on it, but I will include a birdcage with a new washer. About 500-600 rds through this upper, only selling to fund another build. $200 (does not come with optic).
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