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Hi Steve, Features: Forged 7075-T6 Black hardcoat anodized Mil-Spec components M4 carbine stock and pistol grip Equipped with a 6-position buffer tube, the M4 lower receiver allows for easy customization to match your preferred shooting style and ergonomics. The M4 Carbine Stock and A2 Pistol Grip enhance comfort and control. . Mil-Spec components, including the trigger guard, safety selector, and trigger, ensure reliable operation and compatibility with other Mil-Spec parts. Whether you're assembling a new rifle or upgrading an existing platform, the Bushmaster M4 Complete Lower Receiver delivers proven performance and versatility for a wide range of shooting applications. . Stay safe & have a great day!

Hi Steve and welcome. This newer lower uses a "Mil-Spec" Buffer Tube. Cheers, stay safe and enjoy!

These are mil spec lowers.

This would be mil-spec.

Mil-spec buffer