The CMMG Pistol Tube Assembly (brand part number 55CA67D) converts an AR pistol’s adjustable-position buffer tube to a smooth-sided pistol tube. CMMG designs the kit so shooters can reuse their existing buffer, spring, and castle nut rather than buying an entirely new buffer system, keeping the swap affordable. The kit includes the pistol buffer tube itself along with an ambidextrous sling receiver end plate, giving the finished pistol a clean, brace-ready profile with a sling mounting point built in.

Key Specifications

• Smooth-Sided Pistol Tube replaces an adjustable-position buffer tube.
• Ambi Sling Receiver End Plate Included adds a sling mounting point on either side.
• Reuses Existing Buffer, Spring, and Castle Nut keeps the upgrade affordable.
• Black Finish matches most black AR pistol builds.
• AR Platform Compatibility fits standard AR-15/AR-10 pistol builds.

Frequently Asked Questions

Do I need a new buffer and spring for this? No, you reuse your existing buffer, spring, and castle nut.

Does this include a sling mount? Yes, an ambidextrous sling receiver end plate is included.

Buy the CMMG Pistol Tube Assembly, Black, with Ambi Sling End Plate

Clean up your pistol build with a CMMG Pistol Tube Assembly from our AR buffer system selection. Order online and we’ll ship it straight to your door from our Lubbock, Texas gun shop.