This BCM mil-spec carbine receiver extension (brand part number BCM MILSPEC RE) is machined from 7075-T6 for AR15, M16, and M4 platforms.

Key Specifications

• Style: Mil-Spec dimensions.
• 6-position carbine receiver extension.
• Machined from 7075-T6 aluminum.
• Fits AR15, M16, M4 platforms.
• Mil-Spec tubes have a slightly smaller diameter where the stock slides on, versus commercial-spec.

Frequently Asked Questions

Will a commercial-spec stock fit this tube?
No — mil-spec receiver extensions have a slightly smaller diameter than commercial-spec, so use a mil-spec-compatible stock.

What platforms does this fit?
AR15, M16, and M4 builds.

Buy the BCM Mil-Spec 6-Position Buffer Tube

Build on a receiver extension made to true mil-spec dimensions. Ships fast from a Lubbock, TX gun shop, part of our Bravo Company Mfg / BCM lineup in our rifle parts selection.