Thanks to @DoglegArms for the lower and @Toby for chopping and threading the barrel.
NFA Barrel (7" 1/2×28 threading), lower, BCG
Seekins 7" MCSR V2 rail
PSA LPK
Spartan Slick Side Billet Upper
KAK Industries 9mm Buffer
Charging Handle from the parts bin
Pistol tube from the parts pin
MOE K2...