Armaspec SMB Gen3 H3 Sound Mitigation Buffer — Silent Captured AR-15 Buffer

Overview

The Armaspec Sound Mitigation Buffer™ Gen3 (SMB™) H3 is a single-stage captured drop-in replacement for your standard AR-15 buffer and spring. Silent operation. Adjustable spring tension. H3 weight — the recommended threshold for forced reset trigger builds, suppressed AR-15s, and short-gas platforms. Lifetime warranty. 100% USA made. $59.99.

If you're running a forced reset trigger or Super Safety on a suppressed rifle, a short-gas or sub-16" build, or any platform that demands maximum cycle control — the H3 SMB Gen3 is the buffer. More mass than the H2 minimum, silent captured operation, and fully adjustable spring tension at the same $59.99 price point.

Specifications

What's Included

• 1x Polymer base guide rod
• 1x Adjustable main spring
• 1x H3 weight buffer

Features

• Single-stage captured system — buffer, spring, and guide rod drop in as one unit
• H3 equivalent weight (5.6 oz) — recommended for forced reset trigger builds, suppressed builds, and short-gas platforms
• Silent operation — spring rides on polymer guide rod, eliminating metal-on-tube contact noise
• Reduces felt recoil — greater mass for smoother, more controlled deceleration and return
• Adjustable spring tension — trim at 0.25 lbs per coil, up to 12 coils maximum
• Drop-in replacement — no gunsmithing, no modification to lower or buffer tube
• Lifetime warranty
• 100% USA made

H2 vs H3 — Which SMB Do You Need?

Why Silent Matters on a Forced Reset Trigger Build

A standard buffer spring scrapes against the inner wall of the buffer tube every time the BCG cycles. On a forced reset trigger or Super Safety build — where cycling rates are significantly higher than standard semi-auto fire — that friction compounds. More cycles per second means more heat, more noise, and faster spring fatigue.

The SMB Gen3 eliminates spring-to-tube contact entirely. The polymer guide rod centers the spring throughout the cycling stroke, front and back, keeping metal off metal. The result is quieter operation, less heat in the tube, and a spring that maintains consistent tension through higher round counts — which means more consistent timing for your forced reset trigger reset cycle.

At $59.99 with a lifetime warranty, the H3 SMB Gen3 is the best value heavy buffer available for any forced reset trigger or Super Safety build on an AR-15 platform.

Installation

• Insert polymer base with guide rod into the buffer tube
• Insert the spring onto the guide rod
• Insert the buffer over the spring

No tools required. Drop-in replacement for any standard AR-15 carbine buffer tube setup.

Related Products & Resources

• Armaspec SMB Gen3 H2 Silent Captured Buffer — $59.99
• Odin Works HFRT All-In-One Buffer System — $79.99
• Odin Works H-FRT9 — AR9 / 9mm Blowback Buffer — $79.99
• H2 Heavy Buffer 4.6 oz — V2 Reciprocating
• H3 Heavy Buffer 5.4 oz Tungsten — V2 Reciprocating
• Partisan Disruptor FRT — AR-15 Forced Reset Trigger ($299.99)
• The LAT — 3-Position Match Grade FRT ($374.99)
• Partisan Disruptor Ambi FRT — SBW Selector ($324.99)
• Hoffman Tactical Super Safety
• AS Designs ARC-Fire V2
• All AR-15 Buffers for FRT Triggers

FRT Resources

• Best FRT Triggers for AR-15 — 2026 Buyer's Guide
• Best Buffer for Forced Reset Trigger AR-15 Builds
• Odin Works Buffers — FRT & Super Safety Guide
• Are FRT Triggers Legal? State-by-State Guide
• FRT vs Super Safety — What's the Difference?
• FRT Blog — Tips, Guides & News