Guntec USA AR-15 Complete 5.56 Upper Receiver W/O Lower Parts Kit, N.3, 15in Air-Lok M-Lok Handguard, MLS Gen 2 Stock Assembly, Carbine Length, .750 Gas Block, 16in 5.56mm M4 4150 Barrel, 1-7 Twist, 1

Smith & Wesson AR-15 Complete Lower Parts Kit, 1085634

Guntec USA AR Complete .308 Upper Receiver W/O Lower Parts Kit, N.1, 15in M-Lok Handguard, .308 Gen 2 M.L.S. Stock Assembly, Mid-Length, .750 Gas Block, 16in M4 4150 Barrel, 1-10 Twist, 5/8X24 A2 Bird

Stag Arms AR-10 Stag 10 Lower Parts Kit, Left Hand, STAG310741

TRYBE Defense Mil-Spec Complete Lower Parts Kit For AR-15, LPKMIL

Guntec USA AR-15 Complete Lower Parts Kit W/Ergonomic Polymer Pistol Grip, LPK-GRIP

Guntec USA AR-15 Lower Parts Kit, No Fire Control Group Grip, LPK-NFCG

Aero Precision Lower Parts Kit, AR-15, Magpul MOE SL, No Fire Control Group/Trigger, Flat Dark Earth, APRH100983

Timber Creek AR Lower Parts Kit, Tungsten, AR LPK T

KAK Industry Lower Parts Kit, For AR-15, Black, Does Not Include Fire Control Group 506-1015-009

Tacfire AR-10 Lower Parts Kit With PGAR-B Pistol Grip LPK02B308

WMD Guns Lower Parts Kit AR-15 Mod 3, Nitromet, Nib-X FCG, Nickel/Black, 1-NIBXLPKM3

Aero Precision Lower Parts Kit, M4E1, Magpul MOE, Anodized Black, APRH100968

Aero Precision Lower Parts Kit, M5, Magpul MOE, No Fire Control Group/Trigger, Flat Dark Earth, APRH100977

Aero Precision Lower Parts Kit, M4E1, Magpul MOE, No Fire Control Group/Trigger, Flat Dark Earth, APRH100985