Armaspec SMB Gen3 H2 Sound Mitigation Buffer — Silent Captured AR-15 Buffer

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The SMB Gen3 H2 has an equivalent weight of 4.7 oz — meeting the H2 minimum threshold required for reliable forced reset trigger operation on AR-15 platforms. It works with the Partisan Disruptor FRT, AS Designs ARC-Fire V2, Hoffman Tactical Super Safety, and other drop-in forced reset systems." } }, { "@type": "Question", "name": "What makes the SMB Gen3 different from a standard heavy buffer?", "acceptedAnswer": { "@type": "Answer", "text": "The SMB Gen3 is a captured system — the buffer, spring, and guide rod are all integrated into one drop-in unit. The spring rides on the polymer guide rod rather than rubbing against the buffer tube wall, eliminating the metallic spring noise that standard buffers produce. It also features adjustable spring tension — the main spring can be trimmed at 0.25 lbs per coil to reduce tension, up to 12 coils maximum." } }, { "@type": "Question", "name": "What is the actual weight vs equivalent weight of the H2 SMB?", "acceptedAnswer": { "@type": "Answer", "text": "The complete H2 SMB system weighs 5.81 oz actual. The equivalent weight — which is the effective cycling weight for buffer timing purposes — is 4.7 oz, matching the H2 threshold required for forced reset trigger builds." } }, { "@type": "Question", "name": "Does the SMB Gen3 come with a lifetime warranty?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. The Armaspec SMB Gen3 includes a lifetime warranty and is 100% USA made." } } ] } .smb { font-family: inherit; color: #111; line-height: 1.65; } .smb h2 { font-size: 18px; font-weight: 700; margin: 28px 0 10px; padding-top: 28px; border-top: 1px solid #e8e8e8; letter-spacing: .3px; } .smb h2:first-child { margin-top: 0; padding-top: 0; border-top: none; } .smb h3 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 1.5px; color: #cd7f2e; margin: 20px 0 8px; } .smb p { font-size: 14px; color: #444; margin-bottom: 12px; line-height: 1.7; } .smb ul { padding-left: 0; list-style: none; margin: 0 0 14px; } .smb ul li { font-size: 14px; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f0f0f0; position: relative; } .smb ul li::before { content: '▸'; color: #cd7f2e; position: absolute; left: 0; } .smb .spec-table { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: 14px; } .smb .spec-table th { background: #f8f8f8; font-weight: 600; text-align: left; padding: 8px 12px; border: 1px solid #e8e8e8; color: #111; width: 40%; font-size: 13px; } .smb .spec-table td { padding: 8px 12px; border: 1px solid #e8e8e8; color: #444; } .smb .spec-table tr:nth-child(even) td { background: #fafafa; } .smb .note { background: #fff8f0; border-left: 3px solid #cd7f2e; padding: 10px 14px; margin: 14px 0; font-size: 13px; color: #7a5520; border-radius: 0 3px 3px 0; line-height: 1.6; } .smb .frt-callout { background: #f0faef; border-left: 3px solid #1a7a1a; padding: 10px 14px; margin: 14px 0; font-size: 13px; color: #1a5a1a; border-radius: 0 3px 3px 0; line-height: 1.6; } .smb .warn { background: #fff5f5; border-left: 3px solid #c84a4a; padding: 10px 14px; margin: 14px 0; font-size: 13px; color: #8a2020; border-radius: 0 3px 3px 0; line-height: 1.6; } .smb .value-bar { background: #111; color: #fff; padding: 12px 16px; border-radius: 3px; margin: 16px 0; font-size: 13px; font-weight: 600; text-align: center; letter-spacing: .5px; } .smb .value-bar span { color: #cd7f2e; } Overview The Armaspec Sound Mitigation Buffer™ Gen3 (SMB™) H2 is a single-stage captured drop-in replacement for your standard AR-15 buffer and spring. Silent operation. Adjustable spring tension. H2 weight for forced reset trigger and Super Safety compatibility. Lifetime warranty. 100% USA made — all for $59.99. This is the perfect blend of engineering and value for any AR-15 build running a forced reset trigger, Super Safety, or drop-in FRT system. You get the heavy buffer weight your FRT demands, silent captured spring operation that eliminates buffer tube rattle and spring noise, and full adjustability — in one drop-in unit that costs the same as a standard buffer. $59.99 · H2 Heavy Weight · Silent Captured System · Lifetime Warranty · 100% USA Made FRT & Super Safety Compatible: The SMB Gen3 H2 meets the H2 minimum weight threshold (4.7 oz equivalent) required for reliable operation with forced reset triggers and Super Safeties on AR-15 platforms. Works with the Partisan Disruptor FRT, AS Designs ARC-Fire V2, Hoffman Tactical Super Safety, and any other drop-in forced reset system on a standard AR-15 platform. Specifications Product Sound Mitigation Buffer™ Gen3 — H2 SKU ARM258-H2 System Type Single-stage captured drop-in — buffer + spring + guide rod Actual Weight (Complete) 5.81 oz Equivalent Weight 4.7 oz (H2) Spring Adjustment Trimmable at 0.25 lbs per coil — max 12 coils Platform AR-15 — standard carbine buffer tube FRT Compatible Yes — meets H2 minimum threshold Super Safety Compatible Yes 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 H2 weight buffer Features Single-stage captured system — buffer, spring, and guide rod drop in as one unit H2 equivalent weight (4.7 oz) — meets minimum threshold for forced reset trigger and Super Safety builds Silent operation — spring rides on polymer guide rod, eliminating metal-on-tube contact noise Reduces felt recoil — smoother deceleration and return compared to standard carbine buffers 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 Why Silent Matters on a Forced Reset Trigger Build A standard buffer spring rattles against the inner wall of the buffer tube every time the BCG cycles. On a normal AR-15 running a standard mil-spec trigger, that noise is just background — annoying but inconsequential. On a forced reset trigger or Super Safety build where you're cycling at significantly higher rates of fire, that rattle compounds with every cycle, the tube heats up faster, and spring fatigue comes earlier. The SMB Gen3 eliminates that entirely. The polymer guide rod keeps the spring centered and off the tube wall throughout the entire cycling stroke — forward and rearward. Quieter operation, less heat transfer to the tube, and a spring that maintains consistent tension longer because it's not being abraded against a steel tube on every cycle. You get all of that plus the H2 heavy weight your forced reset trigger or Super Safety requires — at the price of a standard buffer. There is no better value in an AR-15 FRT buffer at $59.99. Running a suppressed build or a carbine under 16"? Consider stepping up to the SMB Gen3 H3 — the additional weight helps manage the increased gas volume and faster cycling that suppressed or short-gas builds generate with a forced reset trigger. 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 H3 Silent Captured Buffer — $59.99 Odin Works HFRT All-In-One Buffer System — $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) Disruptor FRT + Odin Works HFRT Bundle — Save $30 ($350) 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 Show more