Phase 5 AR-15 Pistol Buffer Tube

The Phase 5 Pistol Buffer Tube is a receiver extension from Phase 5 (brand part no. PBT) built specifically for AR pistol builds rather than a stocked carbine. It threads onto the lower receiver like a standard buffer tube and houses the buffer and action spring, but its pistol-length contour and lack of stock-attachment features keep the build legally configured as a pistol rather than a rifle. It is a foundational part for anyone assembling a compliant AR pistol from the lower up.

Key Specifications

• It is contoured specifically as a pistol buffer tube, not a carbine or rifle-length receiver extension.
• It houses the buffer and action spring that cycle the action, the same function as any AR-15 receiver extension.
• It threads onto a standard AR-15 lower receiver like a mil-spec buffer tube.

Frequently Asked Questions

Can I attach a stock to this? No, it is built as a pistol-specific buffer tube without stock-attachment features, keeping the build correctly configured as a pistol.

Does this fit a standard AR-15 lower? Yes, it threads onto a standard AR-15 lower receiver the same way a mil-spec buffer tube does.

Buy the Phase 5 AR-15 Pistol Buffer Tube

Order the Phase 5 AR-15 Pistol Buffer Tube through our handgun parts selection at Schaefer Defense and we will ship it fast, fully insured, from our Lubbock, TX gun shop.