5.56x45mm NATO Rifles

SI Defense ~ SI-D ~ 5.56 NATO

CMMG ~ MK4 ~ 5.56x45MM NATO

Rock River Arms ~ LAR-15 ~ 5.56 NATO

Palmetto PA-15 5.56 NATO Semi-Auto Rifle

Diamondback Arms DB15 5.56 NATO Semi-Auto Rifle

Palmetto PA-15 5.56 Nato Semi-Auto Rifle

Colt ~ Model CSR15 ~ 5.56 NATO

Core Elite~CEO-15~5.56 NATO

BROWNING ~ 1885 ~ .223/5.56

CMMG ~ MK4 ~ Dissent ~ .5.56x45 MM Nato

Stag Arms ~ STAG-15 ~ 5.56 Nato

Anderson Manufacturing ~ AM-15 ~ 556x54mm NATO

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 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

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