5.56x45mm NATO Upper Receivers

Spike s Tactical Crusader Semi-automatic Lower/Upper Set 223 Rem/556NATO Tungsten Cerakote

Spikes Tactical Crusader Lower/Upper Set Patriot Brown .223 Rem / 5.56 NATO with 10 BARS Rail

Sionics Weapon Systems (SWS) AR-15 Premium Complete 5.56 Upper Receiver - 11.5" (Phosphate BCG)

RogueOps RO21 5.56 NATO SBR - 11.5" (Black)

PSA "Sabre" Billet 13.7" 5.56 Nitride 13" Sabre Lock Up Rail and JMAC GFHC-E Pin/Weld with B5 Furniture

PSA Upper JAKL, 10.5" 5.56 NATO 1:7 Nitride, With BCG and Lower Build Kit, JAKL MOE EPT w/o Brace, ODG

PSA Upper JAKL, 10.5" 5.56 NATO 1:7 Nitride, With BCG and Lower Build Kit, JAKL MOE EPT w/o Brace, FDE

PSA JAKL 10.5" 5.56 NATO 1/7 Nitride MOE EPT Triangle Side Folding Pistol Kit, FDE

PSA JAKL 10.5" 5.56 NATO 1/7 Nitride Classic EPT Pistol Kit

PSA 16" Mid-Length 5.56 NATO 1:7 Nitride 13.5" Lightweight M-Lok Classic Rifle Kit

PSA 16" CHF A2 Mid-Length 5.56 NATO 1/7 13.5" Lightweight M-Lok MOE EPT Rifle Kit - 5165448203

PSA 16" Midlength 5.56 NATO 1:7 Nitride MOE ODG Rifle Kit - 516444601

BLEM PSA Freedom AR-15 Rifle Kit 5.56 16" M4 Carbine-Lgth 1:7 Nitride - 507617B

PSA 16" M4 Carbine Length 5.56 NATO 1:7 Nitride Freedom Rifle Kit - 507617

Maxim Defense SDX 510 5.56 NATO Integrally Suppressed Upper - 10.3" Urban

HM Defense P15 300 SS Barrel HMP15-STFSS-300

HM Defense HM15 556 Billet Upper & Lower SS bbl HM15-SPFSS-556-LR

HM Defense HM15 5.56 NATO Camo Billet Upper & Lower HM15-SPFCR-556-Camo

HM Defense HM15 Billet Lower and Upper Set Black HM15LU-Set

Ghost Firearms Upper Receiver Pistol Lower Parts Kit 5.56mm 7.5in Pistol 4150 Moly Steel Barrel 1-7 Twist 7in M-LOK Free Float Hand Guard A2 Flash

Ghost Firearms Upper Receiver Pistol Lower Parts Kit 5.56mm 7.5in Pistol 4150 Chrome Moly Steel Barrel 1-7 Twist 7in M-LOK Free Float Hand Guard A2

Ghost Firearms Upper Receiver Pistol Lower Parts Kit 5.56mm 7.5in Pistol 4150 Moly Steel Barrel 1-7 Twist 7in M-LOK Free Float Hand Guard A2 Flash

Ghost Firearms Upper Receiver Pistol Lower Parts Kit 5.56mm 7.5in Pistol 4150 Chrome Moly Steel Barrel 1-7 Twist 7in M-LOK Free Float Hand Guard A2

Ghost Firearms Upper Receiver Pistol Lower Parts Kit 5.56mm 7.5in Pistol 4150 Moly Steel Barrel 1-7 Twist 7in M-LOK Free Float Hand Guard A2 Flash