AR-15 & M16 Lower Receiver, M4 Stripped Lower

U.S. Arms has developed a revolutionary new device that improves barrel stability and accuracy through a secure fit. Shop our AR-15 & M16 lower receivers today.
The USAC M-4 CLS Cam-Lock UTAW Lower Receiver improves the accuracy of any AR-type firearm. This is a stripped lower receiver. Includes trigger guard.

M16A4 Clone Complete Lower - Anodized Black

Aero Precision M4E1 Enhanced Forged Stripped Lower Receiver

M16A4 Clone Complete Lower - Anodized Black

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How important is the brand of upper and lower receivers? : r/ar15

Harrington & Richardson M16A2 Special Forces COTS Marked Stripped

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FN FN15 Forged Stripped Lower Receiver