Armaspec SMB Buffer Kit for AR-15 Gen 3 H2
Not Yet Rated | Write the First Review SKU: 222-ARM-ARM268-H2
UPC: 810048492749
MFG#: ARM268-H2

SMB™ Buffer Kit for AR-15 Gen 3 H2 (ARM268-H2)

This is the all-in-one buffer tube kit for builders who want a cleaner recoil feel and less spring noise—without chasing parts across multiple listings. The kit pairs the SMB Gen 3 captured buffer system with the receiver extension hardware needed to finish the back end of an AR-15 lower.

What’s included

• SMB-H2 buffer system (H2 weight option, 4.7 oz)
• Buffer tube / receiver extension
• End plate
• Castle nut

Why the SMB system is different

Traditional setups can get noisy when the spring drags along the inside of the tube. SMB is designed to keep the spring from rubbing the inner wall, which helps deliver smoother, quieter operation while supporting recoil management.

Specs

• MPN / SKU: ARM268-H2
• Buffer type: H2
• Buffer weight: 4.7 oz

Fitment

• Listed as compatible with AR-15 pattern firearms
• If your build uses proprietary receiver extensions or unusual components, confirm compatibility before ordering

Good to know

• This kit is meant to simplify a build: one kit covers the buffer system plus the tube hardware
• For best results and safety, follow manufacturer guidance and use a qualified armorer if you’re unsure about fitment

FAQ

Is this a complete kit or just the buffer?

It’s a complete kit: SMB buffer system plus buffer tube, end plate, and castle nut.

What does “H2” mean on this kit?

H2 refers to the buffer weight option included in this version. The SMB-H2 is listed as 4.7 oz.

What’s the main benefit versus a standard buffer and spring?

SMB is designed to reduce the sound and friction created when a standard spring rubs inside the buffer tube, while supporting smoother operation.

Will it fit my AR-15?

Retail listings describe it as fitting AR-15 pattern firearms. If you’re using a proprietary stock system or non-standard parts, verify compatibility before purchase.