The Armaspec SMB Buffer Kit for AR10, Gen 3 (brand part no. ARM268-AR10) is a complete drop-in buffer upgrade built around Armaspec’s Sound Mitigation Buffer (SMB) system, sized for AR10-pattern .308 rifles. Armaspec scaled the SMB’s mass to match the heavier bolt-carrier group and stronger recoil impulse of a .308-class AR, aiming to smooth and quiet cycling compared to a factory buffer. A heavier-recoiling .308 AR benefits even more than a 5.56 gun from a buffer that is properly matched to its bolt-carrier weight and gas system, since mismatched mass shows up as harsher recoil and louder buffer-tube slap. This kit includes everything needed to complete the buffer system, so there is no need to source a separately matched spring.

Key Specifications

• Built around Armaspec’s Sound Mitigation Buffer (SMB) design for quieter, smoother cycling than an OEM buffer.
• Sized specifically for AR10-pattern .308 rifles, matched to their heavier bolt-carrier group and recoil impulse.
• Sold as a complete buffer tube assembly kit, including the matched spring needed alongside the SMB weight.

Frequently Asked Questions

Will this fit a standard AR-15? No, this kit is sized specifically for AR10-pattern .308 rifles, not AR-15 platforms.

Does this kit include the spring? Yes, it is a complete buffer tube assembly with the SMB weight and its matched spring.

Buy the Armaspec SMB Buffer Kit for AR10

Smooth out the recoil and cycling of a .308 AR with a buffer system built specifically for the platform. Browse Schaefer Defense’s AR10 parts selection and order from our Lubbock, Texas gun shop — we’ll get it out to you as soon as it’s ready to ship.