The Phase 5 Hex-2 Buffer Tube Assembly (brand part number HEX2C) is purpose-built for AR-pistol builds, with a hexagonal front section and a round rear section sized to accept SB Tactical Pistol Stabilizing Braces that use a 1.2-inch round buffer tube. Phase 5 machines the tube from heavy-duty, USA-certified 7075 T7 billet aluminum for a genuinely heavy-duty foundation. The Hex-2-C Complete Package ships with everything needed to finish the build: the Hex-2 buffer tube, castle nut, end plate, a 3.5-inch Phase 5 nitrile foam pad, a carbine buffer, and a Phase 5 Enhanced buffer spring. An SB Tactical brace is sold separately and is not compatible with adjustable-type braces like the SBA3, SBA4, or PDW.

Key Specifications

• Features a hexagonal front, round rear profile.
• Sized for SB Tactical braces using a 1.2-inch round buffer tube.
• Not compatible with adjustable braces like the SBA3/SBA4/PDW.
• Machined from 7075 T7 billet aluminum.
• USA-certified heavy-duty construction.
• Includes a castle nut and end plate.
• Includes a 3.5-inch Phase 5 nitrile foam pad.
• Includes a carbine buffer.
• Includes a Phase 5 Enhanced buffer spring.

Frequently Asked Questions

What braces does this fit? SB Tactical Pistol Stabilizing Braces that use a 1.2-inch round buffer tube; it’s not compatible with adjustable braces like the SBA3, SBA4, or PDW.

Does it come with the buffer and spring? Yes, the Hex-2-C Complete Package includes a carbine buffer and a Phase 5 Enhanced buffer spring.

Is a brace included? No, an SB Tactical brace is sold separately.

Buy the Phase 5 Hex-2 Buffer Tube Assembly, Black, AR-Pistol

Finish your AR-pistol build with a complete, brace-ready buffer tube kit. Order the Phase 5 buffer tube assembly from our rifle stocks selection at our Lubbock, Texas gun shop.