5.56x45mm NATO Gun Parts

CMMG Mk4 5.56X45mm NATO Resolute Upper Group Receiver 16.1in Coyote Tan

TRYBE Defense AR-15 5.56x45mm NATO 16in Complete Upper Receiver Government Mid Length 1-7 Twist 1/2x28 A2 Black

TRYBE Defense AR-15 5.56x45mm NATO 16in Complete Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Black

TRYBE Defense AR-15 5.56x45mm NATO 16in Complete Upper Receiver Pencil Carbine Length 1-7 Twist 1/2x28 A2 Black

Dirty Bird 16 RECCE V2 5.56 M-LOK Upper Assembly

Spikes Tactical Upper 5.56 11.5in FN CHF w/FDE MOE Handguards & FSP

Spikes Tactical Upper 5.56 16in CHF Midlength w/ 12in SAR3 Rail

Spikes Tactical Spartan Set, Semi-automatic, Matching Lower/Upper Handguard Set, 223 Rem/556NATO, 10 in MLOK Rail, CNC Machined from a 7075 Billet Aluminum, Bronze Battleworn STSB610-CM1

Spikes Tactical Upper 5.56 18in LW SPR w/13.2in SAR3 Rail

Spikes Tactical Upper 5.56 8.1in CHF Barrel w/7in SAR3

Spikes Tactical Upper 5.56 14.5in 16in OAL Midlength Lightweight LE w/9in SAR3 Rail w/ Vortex FH

Spikes Tactical Upper 5.56 14.5in 16in OAL Midlength Lightweight LE w/13.2in SAR3 Rail w/ Vortex FH

Spikes Tactical Upper 5.56 14.5in 16in OAL Midlength Lightweight LE w/12in M-LOK Rail w/ Dynacomp

Spikes Tactical Upper 5.56 16in Midlength LE w/13.2in SAR3 Rail

Spikes Tactical Upper 5.56 16in Midlength LE w/12in M-LOK Rail

Spikes Tactical Upper 5.56 16in M4 LE w/9in SAR3 Rail

Spikes Tactical Upper 5.56 16in M4 LE w/7in SAR3 Rail & FSP

Spikes Tactical Upper 5.56 16in M4 LE w/9in M-LOK Rail

Spikes Tactical Upper 5.56 16in M4 LE w/7in M-LOK Rail & FSP

Spikes Tactical Upper 5.56 16in M4 LE w/13.2in M-LOK Rail

Ar-15 Blem Super Duty Stripped Lowers - Ar-15 Blemished Super Duty Lower 5.56mm 40mm Green

Armaspec AR10 Gun Builders Lower Parts Kit SS/Bronze

Armaspec Superlight .223/5.56mm Lower Parts Kit SS/Bronze

Armaspec Superlight .223/5.56mm Gun Builders Kit SS/Bronze