5.56x45mm NATO Upper Receivers

Ghost Firearms Upper Receiver Rifle Lower Parts Kit 5.56mm 16in Butt Stock 4150 M4 Barrel 1-7 Twist 14in M-LOK Free Float Hand Guard A2 Muzzle Device

Ghost Firearms Complete Upper Receiver Rifle Lower Parts Kit 5.56mm 16in Butt Stock 4150 M4 Barrel 1-7 Twist 14in M-LOK Free Float Hand Guard A2

Ghost Firearms Upper Receiver Pistol Lower Parts Kit 5.56mm 10.5in Carbine 4150 M4 Barrel 1-7 Twist 11in M-LOK Free Float Hand Guard Flash Can

Ghost Firearms Complete Upper Receiver Pistol Lower Parts Kit 5.56mm 10.5in Carbine 4150 M4 Barrel 1-7 Twist 11in M-LOK Free Float Hand Guard Flash

Geissele Automatics Geissele Super Duty 5.56 NATO 10.3" 1:7" CHF Bbl DDC Pistol 08-186SP

Daniel Defense DDM4 V7 S, 5.56mm, 11.5 Barrel, Black, Upper Receiver Group + Vortex AMG Eleanor EBR-22L 1-10x24 MOA Scope w/ RPM Mount

Centurion Arms CM4 Forged 5.56 Stripped Upper/Lower Set - Thermal Fit

Centurion Arms CM4 5.56 Forged AR-15 Receiver Set

Battle Arms Development BATTLE ARMS AUTHORITY ELITE BILLET Lightweight AR-15 Receiver Set, 7075-T6 Aluminum, Ambi.

Bravo Company MFG (BCM) MK2 AR-15 5.56 NATO Complete Upper Receiver Group - 18"

Bravo Company 610-890-ELW RECCE-11 KMR-A 11.5\" 1:7 .223 / 5.56

Andro Corp Industries CQB 8 MOD 1 5.56 Pistol - 8"

Anderson AR-15 Pistol, 10.5\" BBl, 9.5\" M-Lok Handguard, Magpul Brace & Grip, 5.56 Nato,1 In 7 Twist, Forged Upper & Lower, M16 BCG - B2-K870-A006-B

Aero Precision M4E1 Builder Set w/ 10.3" ATLAS R-ONE M-LOK Handguard - Gunmetal Grain

Aero Precision M4E1 Builder Set w/ 9.3" ATLAS R-ONE M-LOK Handguard - MTC Dark Camo

Aero Precision M4E1 Builder Set w/ 9.3" ATLAS S-ONE M-LOK Handguard - MTC Dark Camo

Aero Precision M4E1 Builder Set w/ 9.3" Enhanced M-LOK Handguard - MTC Dark Camo

Aero Precision M4E1 Builder Set w/ Enhanced M-LOK Handguard - OD Snakeskin - 15"

Aero Precision M4E1 Builder Set w/ Enhanced M-LOK Handguard - OD Snakeskin - 10.7"

Aero Precision M4E1 Builder Set w/ 9.3" ATLAS S-ONE M-LOK Handguard - Midnight Rider Cerakote

Aero Precision M4E1 Builder Set with 7\" ATLAS S-ONE Handguard - Anodized Black - APCS100179

DPMSKITTY KAT HGA 5.56 NATO 7.5IN BBL C7 FSB CAR BRACE FDE 30RD MAG

CMMG Bravo Rimfire AR-15 Conversion Kit with 3 10-Round Magazines 22 LR Stainless Steel

Daniel Defense MK18 AR-15 Pistol Complete Upper Receiver 5.56mm NATO 10.3" Barrel Black