Armaspec SMB Gen3 H3 Sound Mitigation Buffer — Silent Captured AR-15 Buffer
Armaspec SMB Gen3 H3 Sound Mitigation Buffer — Silent Captured AR-15 Buffer
Regular Price: $59.99
Member's Price: $57.00
Members Save 5% ($2.99)
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
| Product | Sound Mitigation Buffer™ Gen3 — H3 |
|---|---|
| SKU | ARM258-H3 |
| System Type | Single-stage captured drop-in — buffer + spring + guide rod |
| Actual Weight (Complete) | 6.71 oz |
| Equivalent Weight | 5.6 oz (H3) |
| Spring Adjustment | Trimmable at 0.25 lbs per coil — max 12 coils |
| Platform | AR-15 — standard carbine buffer tube |
| FRT Compatible | Yes — exceeds H3 recommended threshold |
| Super Safety Compatible | Yes |
| Suppressed Build Compatible | Yes — recommended for suppressed FRT builds |
| Patent | Pat. Pend. |
| Warranty | Lifetime |
| Origin | 100% USA Made |
| Price | $59.99 |
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?
| SMB Gen3 H2 | SMB Gen3 H3 (This Product) | |
|---|---|---|
| Equivalent Weight | 4.7 oz | 5.6 oz |
| FRT Threshold | Minimum viable | Recommended |
| Suppressed Builds | Marginal | Yes — recommended |
| Short Gas / Sub-16" | May need tuning | Recommended |
| Standard Carbine 16" | Works well | Works well — more margin |
| Price | $59.99 | $59.99 |
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
