5.56x45mm NATO Receivers

Andro Corp Industries ACI-15 Forged Receiver Set with 15" MLOK Handguard Flat Dark Earth

Brn-4 Assembled Upper Receivers - Brn-4 Assembled Upper Receiver 14.5'''' Heavy Barrel Black

Brn-4 Assembled Upper Receivers - Brn-4 Assembled Upper Receiver 14.5'''' Medium Barrel Black

Centurion Arms CM4 5.56 Forged AR-15 Receiver Set

KAK Industry KF-15 Forged AR15 Lower Receiver

JP Enterprises JP-15 Forged AR-15 Receiver Set

LANTAC Raven Billet Side Charging AR-15 Receiver Set - 1-RV-SET-SC-RAVEN

Ar-15 Mk12 Mod 0 Gen Iii Upper Receiver - Mk12 Mod 0 Gen Iii Upper Receiver Complete 1-7 Twist Black

Gau-5a Complete Upper Receiver & 4x Retro Carry Handle Scope - Brn Gau-5a 5.56mm 12.7'''' Bbl 1-12 Twist W/Colt 4x21mm Scope

Gau-5a Complete Upper Receiver & 4x Retro Carry Handle Scope - Brn Gau-5a 5.56mm 12.7''''bbl 1-12 Twist Pin/Weld W/Colt 4x21mm

Xm177e2 11.5''''Adeg W/Colt Optic - Brn Xm177e2 5.56mm 11.5'''' Bbl 1-7 Twt Upper Pin/Weld W/4x21mm

M16a1 20'''' Rifle Length Upper W/Colt Ar-15 4x21mm - Brn-16a1 5.56x45 Nato 20'''' Bbl 1-7 Twist Upper W/Colt 4x21mm

Dd 14.5'''' M4a1 Riii Upper Receiver W/ Eotech Optics - Dd 14.5'''' M4a1 Riii Upper W/ Exps3-0 Holographic Red Dot

Dd 14.5'''' M4a1 Riii Upper Receiver W/ Eotech Optics - Dd 14.5'''' M4a1 Riii Upper W/ Exps2-0 Holographic Red Dot

Dd 14.5'''' M4a1 Fsp Upper Receiver W/ Eotech Optics - Dd 14.5'''' M4a1 Fsp Upper W/ Exps3-0 Holographic Red Dot

Dd 14.5'''' M4a1 Fsp Upper Receiver W/ Eotech Optics - Dd 14.5'''' M4a1 Fsp Upper W/ Exps2-0 Holographic Red Dot

Dd 14.5'''' M4a1 Somcom Upper Receiver W/ Eotech Optic - Dd 14.5'''' M4a1 Socom Upper W/ Exps3-0 Holographic Red Dot

Dd 10.3'''' Mk18 Socom Upper Receivers W/ Optics - Dd 10.3'''' Mk18 Socom Upper W/ Exps3-0 Holographic Red Dot

Brn-601 20'''' Upper W/Colt Ar-15 4x21mm Optic - Brn-601 5.56mm 20'''' Upper Receiver With Colt 4x21mm Scope

Mike-15 Stripped Lowers - Mike-15 Stripped Lower Receiver W/Pic Rail 5.56mm

Mk18 Riii 10.3'''' Stripped Upper Receivers W/ Law Folder - Mk18 Riii 10.3'''' Stripped Upper W/ Law Folder Fde

M4a1 Fsp 14.5'''' Stripped Upper Receiver W/ Law Folder - M4a1 Fsp 14.5'''' Stripped Upper W/ Law Folder Fde

Mike-102 Stripped Lowers - Mike-102 Stripped Lower Receiver 5.56mm

Mike-102 Stripped Lowers - Mike-102 Stripped Lower Receiver W/Pic Rail 5.56mm