CMMG 57CA2CB-MB Lower Receiver Assembly, Mk57, Midnight

Lower Receiver Assembly, Mk57, Charcoal Green

Lower Receiver Assembly, Mk57, Sniper Grey

Lower Receiver Assembly, Mk57, Armor Black

When it comes to picking a lower for your 5.7x28mm carbine or SBR, this RESOLUTE Mk57 lower group capitalizes on cross-compatibility, giving you the ability to use the same magazines on your Mk57...

Upper Receiver Assembly, Mk47, Midnight Bronze