5.56x45mm NATO Receivers

BCM MK2 RMS-M1T0 Mod-2 SOPMOD AR-15 Complete Lower Receiver Anodized Flat Dark Earth

Midwest Industries AR-15 Barreled Upper Receiver 223 Remington (Wylde) 16" Barrel 15" Handguard

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm 10.3" Cold Hammer Forged Barrel M-LOK DDC

5.56 NATO COMPLETE UPPER RECEIVER W/HBAR MID-LENGTH BBL FOR AR15

Cobalt Kinetics CK-Pro Receiver Set 6.75

FN FN15 AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel

Aero Precision AR-15 M4E1 Barreled Upper Receiver 5.56x45mm NATO 16" Barrel Atlas S-One M-LOK Handguard Black

Geissele Super Duty AR-15 Pistol Barreled Receiver 5.56x45mm NATO 11.5" Barrel Black

Geissele Automatics Super Duty Stripped Upper - DDC Desert Dirt 5.56 10.3 Barrel

Radian Weapons A-DAC 15 Ambi AR-15 Lower Receiver

LMT Defense MARS-L PDW Lower 5.56 / .300 AAC Blackout

BCM MK2 RMS-M1T0 Mod-0 SOPMOD AR-15 Complete Lower Receiver Anodized Black

Wraithworks Warp-15 Complete Lower with Fixed Stock

Aero Precision M4E1 Pro Ambidextrous AR-15 Stripped Lower Receiver Black

AERO PRECISION M4E1 Stripped Lower Receiver | Kodiak Brown Anodized

AERO PRECISION M4E1-T NO FA Stripped Upper

AERO PRECISION AR15 5.56 NATO / 223 Rem Complete Upper | Black

Ar15 Comp Assembled Upper 5.56 Nato Carbine Barrel W/Pinned Fsb - 5.56 Assembled Upper 16'''' M4 Bbl W/Moe Sl Carb Handguard Blk

Geissele Super Duty AR-15 Pistol Barreled Receiver 5.56x45mm NATO 14.5" Barrel Black

Geissele Super Duty AR-15 Pistol Barreled Receiver 5.56x45mm NATO 10.3" Barrel Black

M4e1 Assembled Upper Receiver 5.56 Mid-Length - M4e1 5.56 Nato Assem Uppr Rcvr M4 14.5'''' Bbl Mid-Length Black

LANTAC Raven Billet Side Charger AR-15 Receiver Set Black

Grey Ghost Precision Cornerstone Stripped Lower

ODIN WORKS OTR-15 Lower/Upper Set 223 Rem/5.56 NATO Green