5.56x45mm NATO Receivers

Brn-4 Assembled Upper Receivers - Brn-4 Assembled Upper Receiver 10.4'''' Medium Barrel Black

Brn-15A(R) M4 Stripped Upper Receiver - Brn-15 M4 Upper Receiver, Black

Brn-15 11.5'''' Upper Receiver Assembly 5.56mm - Brn-15 5.56 11.5'''' Bbl .750'''' Gb Upper W/Charging Handle & Bcg

Brn-15 13.7'''' Upper Receiver Assembly 5.56mm - Brn-15 5.56 13.7'''' Bbl .750'''' Gb Upper W/Charging Handle & Bcg

Ar-15 16'''' Upper Receiver Assemblies 5.56mm - Brn-15 5.56mm 16'''' Bbl .625'''' Gb Upper W/Charging Handle & Bcg

Ar-15 16'''' Upper Receiver Assemblies 5.56mm - Brn-15 5.56mm 16'''' Bbl .750'''' Gb Upper W/Charging Handle & Bcg

Ar-15/M16 M16a2 Stripped Upper Receiver - Brn Ar-15/M16a2 Stripped Upper Receiver, 5.56 Nato, Black

Desert Tech MDR Conversion Kit 5.56x45

NBS Slick Side Billet Receiver & M-LOK Handguard Combo - 15"

Mk18 Block Ii Tribute Bundle

Brn-4(R) Blem Upper Receiver Assemblies With Nitride Barrels - Blem Brn-4 Assembled Upper 14.5 Md Black Nitride Bbl

Brn-4 Upper Receiver Build Kits - Brn-4 Upper Receiver Build Kit, 16'''' Heavy Barrel

Brn-4 Upper Receiver Build Kits - Brn-4 Upper Receiver Build Kit, 14.5'''' Medium Barrel

Brn-4 Upper Receiver Build Kits - Brn-4 Upper Receiver Build Kit, 10.4'''' Medium Barrel

Xm177e2 Complete Upper Receiver & 4x Retro Carry Handle Scope - Xm177e2 Upper Receiver 11.5'''' 1-7 & Retro Colt 4x Optic (Dupe

Xm177e2 Complete Upper Receiver & 4x Retro Carry Handle Scope - Xm177e2 Upper Receiver 11.5'''' 1-12 & Retro Colt 4x Optic (Dup

Xm177e2 11.5''''Adeg W/Colt Optic - Brn Xm177e2 5.56mm 11.5''''bbl 1-12 Twt Upper Pin/Weld W/4x21mm

Xm177e2 12.7'''' Carbine Length Pinned/Welded W/Colt Ar-15 Optic - Brn Xm177e2 5.56mm 12.7'''' 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 1-12 Twist Upper W/Colt 4x21mm

Dd 10.3'''' Mk18 Riii Upper Receiver W/ Eotech Optics - Dd 10.3'''' Mk18 Riii Upper W/ Exps3-0 Holographic Red Dot

Dd 10.3'''' Mk18 Riii Upper Receiver W/ Eotech Optics - Dd 10.3'''' Mk18 Riii Upper W/ Exps2-0 Holographic Red Dot

Dd 14.5'''' M4a1 Somcom Upper Receiver W/ Eotech Optic - Dd 14.5'''' M4a1 Socom Upper W/ Exps2-0 Holographic Red Dot

Dd 10.3'''' Mk18 Socom Upper Receivers W/ Optics - Dd 10.3'''' Mk18 Socom Upper W/ Exps2-0 Holographic Red Dot

Brn16a2 20'''' Upper W/Colt Ar-15 4x21mm - Brn-16a2 5.56x45 Nato 20'''' Bbl Upper Receiver W/Colt 4x21mm