AR Parts in 5.56x45mm NATO

Ar-15 M4cqb 5.56 Barrel 10.3in - M4cqb Replacement Barrel Stripped 10.3in

14.5'''' M4 Socom Barrel Assembly - 14.5'''' M4 Socom Barrel Assembly With Sight Tower

M16 5.56 Bolt Carrier Group

Aero Ar-15 Assembled Upper 5.56mm Build Kits - Build Kit 5.56mm Assembled Upper 16'''' Carbine 12'''' Hg Black

Aero Ar-15 Assembled Upper 5.56mm Build Kits - Build Kit 5.56mm Assembled Upper 16'''' Mid-Length 12'''' Hg Black

5.56mm Complete Upper Receiver W/Brn Bolt Carrier Group - 5.56mm 16'''' Bbl M4 Comp Uppr Rcvr W/Brn Bcg & Charge Handle

Armorer's Wrench W/ Ar-15 Receiver Rod

M16 Extreme Duty Bolt Carrier Group Assembly

East India 5.56x45 Assembled Upper Receiver Starter Kit For Ar15 - East India 5.56x45 Assmb Upper Medium 16'''' Bbl W/Rail & Fsb

East India 5.56x45 Assembled Upper Receiver Starter Kit For Ar15 - East India 5.56x45 Assembled Upper Medium 10.5'''' Bbl W/Rail

Ar-15 Slim Line Handguards W/ Flip-Up Combat Sights - 15'''' Slim Line Handguard W/ Flip-Up Combat Sights

Ar-15 Lower Parts Kit W/ Geissele 2 Stage Enhanced Trigger

Ar-15 Lower Parts Kit W/ Geissele B-Gc Competition Trigger

Ar-15 Low Mass 5.56 Bolt Carrier Group

Ar-15 M4 Upper Receivers M-Lok 5.56mm - Ar-15 16'''' M4 Upper Assy 5.56 No Bcg/Charging Handle

Ar-15 M4 Upper Receivers M-Lok 5.56mm - Ar-15 16'''' M4 Complete Upper Assembly

Ar-15 Lower Parts Kits W/ Trigger Assemblies - Ar-15 Lpk W/Trigger Assembly Nickel

Ar-15 Lower Parts Kits W/ Trigger Assemblies - Ar-15 Lpk W/Mil-Spec Trigger Black

Ar-15 M16 A1 Upper Receiver - Brn-16a1 M16a1 Upper Receiver Black

M16 5.56 Bolt Carrier Group Nitride Mp - M16 Bcg 5.56 & Ar-15 Charging Handle & (10) Ar-15 30rd Mag

M16 Bcg & Geissele Ar-15 Enhanced Trigger Builder's Bundle - M16 Bcg 5.56mm Nato & Geissele B-Gc Competition Trigger

M16 Bcg, Ballistic Advantage Bbl & Atlas Rail Builder's Bundle - M16 Bcg 5.56mm, Modern Series 16'''' Bbl & 12'''' Atlas Rail

Ar-15 Stag 15 16'''' Upper Build Kit 5.56mm - Ar-15 Stag 15 16 Upper Build Kit 5.56mm

Ar-15 M4e1-T 14.5'''' Upper Build Kit 5.56mm - Ar-15 M4e1-T 14.5 Upper Build Kit 5.56mm