5.56x45mm NATO Receivers

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

Faxon Forged Stripped AR-15 Upper Receiver Aluminum Black

BCM MOD-0 AR-15 Complete Lower Receiver Black

Sharps Bros Warthog AR-15 Stripped Lower Receiver Anodized Black

Radian Weapons A-DAC 15 Builder Kit 5.56 14 Handguard

Aero Precision M4E1 Pro Ambidextrous AR-15 Stripped Lower Receiver Kodiak Brown

Radian Weapons A-DAC 15 Complete Lower 5.56 / .223 Rem w/ SBA3 Brace

CMMG Mk4/AR15 Stripped Lower Receiver Armor Black

Sharps Bros Overthrow AR-15 Stripped Lower Receiver Anodized Black

Sharps Bros Hellbreaker AR-15 Stripped Lower Receiver Anodized Black

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

FightLite Industries Mission Configurable Rifle Complete Upper 5.56 16.25 Threaded Barrel

Aero Precision M4E1 Pro Ambidextrous AR-15 Stripped Lower Receiver OD Green

Diamondback DB15 Lower Black Multi-Cal

Smith & Wesson M&P15 AR-15 Complete Lower Receiver Black

Radian Weapons Model 1 Builder Kit Flat Dark Earth 5.56 14 MLOK Handguard

Spikes Tactical No Logo Multi-Caliber Stripped Lower

BCM BCM4 AR-15 Complete Lower Receiver Anodized Flat Dark Earth

Faxon AR-15 ARAK-21 Complete Upper Receiver 5.56x45mm NATO 16" Barrel

BCM BCM4 Mod-0 AR-15 Complete Lower Receiver Anodized Flat Dark Earth

Smith and Wesson M&P-15 Lower Receiver 5.56 NATO Stripped

Aero Precision M4E1 Stripped Lower Black

BCM MK2 RMS-M1T0 Mod-0 AR-15 Complete Lower Receiver Anodized Flat Dark Earth

Primary Weapons Systems MK1 Mod 2-M Complete Lower 5.56 30-Rounds