5.56x45mm NATO Receivers

M4e1 5.56 Assembled Upper Receiver W/M-Lok Atlas S-One Handguard - M4e1 5.56 Assm Uppr 11.5'''' Carbine 9'''' Atlas S-One Hg Fde

Bcm Mid-Length Complete Upper Receiver W/A2 Flash Hider For Ar15 - 5.56mm 16''''bbl Mid-Length Complete Upper W/A2 Flash Hider

Wilson Combat Receiver Set Armor-Tuff Finish

Mk1 Mod 2-M Complete Rifle Lower Receiver

Dirty Bird AR-15 Forged Multi-Cal Receiver Set + SRMS Handguard - Midnight Bronze, 15

Dirty Bird AR-15 Forged Multi-Cal Receiver Set + SRMS Handguard - FDE, 15

Dirty Bird AR-15 Forged Multi-Cal Receiver Set + SRMS Handguard - Graphite Black, 13.5"

Dirty Bird AR-15 Forged Multi-Cal Receiver Set + SRMS Handguard - OD Green, 9.5"

Dirty Bird AR-15 Forged Multi-Cal Receiver Set + SRMS Handguard - Graphite Black, 9.5"

Stag 15 5.56 M4 Upper Receivers - Stag 15 M4 Phosphate Upper

Stag 15 5.56 18in 3gun Elite Upper Receivers - Stag 15 3gun Elite Upper

Mk1 Patrol 14.5'''' Upper Receiver 5.56mm Black - Mk1 Patrol 14.5 Upper Receiver 5.56mm Black

Ar-15 Stripped Lower Recievers - Soul Snatcher Stripped Lower Receiver Black

PRI Mark 12 Mod 0 AR-15 Complete Upper Receiver 5.56x45mm NATO 18" Barrel 1:8" Twist Black

Ar-15 Kp-15 Stripped Lower Receivers Polymer - Kp-15 Stripped Lower Receiver Polymer Fde

Brn-4(R) Complete Upper Receivers - Brn-4 5.56mm 16'''' Heavy Bbl Complete Upper W/13.5'''' Handguard

Brn-4(R) Complete Upper Receivers - Brn-4 5.56mm 14.5'''' Hvy Bbl Complete Upper W/13.5'''' Handguard

Brn-4(R) Complete Upper Receivers - Brn-4 5.56mm 16'''' Med Bbl Complete Upper W/13.5'''' Handguard

Brn-4(R) Complete Upper Receivers - Brn-4 5.56mm 14.5'''' Med Bbl Complete Upper W/13.5'''' Handguard

Gau-5a 12.7'''' 1-12 Upper Receivers - Brn-Gau-5a Upper Receiver, 12.7'''' 1-12 Twist, Pin/Weld, Black

Xm177e2 Complete Upper Receivers - Brn Xm177e2 Upper Receiver, 11.5'''', 1-7 Twist, Black

Xm177e2 Complete Upper Receivers - Brn Xm177e2 Upper Receiver, 12.7'''' 1-7 Twist, Pin/Weld, Black

Brn16a1(R) 20'''' Complete Upper Receivers - Brn M16a1 Upper Receiver 20'''' Rifle Length, 1-7 Twist, Black

Brn-15 Upper Receivers 5.56mm Nato - Brn-15 5.56mm 13.7'''' Bbl .750'''' Gas Block Upper Receiver