AR-15 Buffer Weight Guide: H2, H2.5, H3, Reciprocating & Silent Buffers Explained (2026)
by Jonathan clausen on Apr 20, 2026
AR-15 Buffer Weight Guide: H2, H2.5, H3, Reciprocating & Silent Buffers Explained (2026)
The buffer is one of the most overlooked components in an AR-15 build — until something goes wrong. Wrong buffer weight causes failures to eject, failures to feed, light primer strikes, excessive felt recoil, and on FRT trigger builds, complete reset failure. Get it right and your rifle runs smooth, quiet, and reliable.
This guide covers every buffer weight in the H-series lineup, explains what reciprocating buffer design means and why it matters, and introduces the all-in-one silent captured spring system for shooters who want to eliminate buffer spring noise entirely.
Why Buffer Weight Matters
The buffer's job is to absorb the rearward energy of the bolt carrier group after each shot and return it forward in time to chamber the next round. Buffer weight determines how fast or slow the BCG moves through its cycle.
Too light: the BCG cycles too fast — bolt unlocks before pressure drops, cases are ejected before fully extracted, and on FRT builds the trigger has no time to reset.
Too heavy: the BCG doesn't travel far enough rearward — failures to eject, bolt doesn't lock back on last round, and in suppressed builds the system becomes sluggish.
The right weight gives your rifle's gas system enough dwell time to do its job cleanly — ejecting brass, resetting the trigger if you're running an FRT, and returning to battery reliably.
Standard Carbine Buffer Weights — The H-Series Explained
The H designation stands for Heavy. H-series buffers add tungsten or steel weights inside the buffer body to increase mass beyond a standard carbine buffer.
Standard Carbine Buffer — 3.0 oz
The buffer that ships in most factory AR-15s. Works fine for standard mil-spec trigger builds running standard pressure ammo. Not recommended for FRT trigger builds — too light for reliable FRT cycling. If you're upgrading to any performance trigger or running a suppressor, you'll likely need to step up.
H1 Buffer — 3.8 oz
One tungsten weight added. Marginal improvement over standard. Still typically insufficient for FRT builds and suppressed setups. A stepping stone weight that most serious builders skip in favor of going straight to H2.
H2 Buffer — 4.6 oz
Two tungsten weights. The most commonly recommended buffer for FRT trigger builds and the minimum starting point for any forced reset trigger. The added mass slows BCG rearward velocity enough to give the FRT mechanism the dwell time it needs to push the trigger forward and complete the reset.
Our AR-15 H2 Heavy Buffer (4.6 oz) uses a V2 reciprocating design — more on that below.
Best for: FRT trigger builds on carbine and mid-length gas systems, suppressed builds on mid-length gas, standard builds wanting smoother operation.
H2.5 Buffer — 5.1 oz
Between H2 and H3. Not a standard industry designation — this is a precision mid-weight that fills the gap for builds where H2 is slightly too light but H3 causes sluggish cycling. Ideal for the Partisan Disruptor bundle because it provides reliable FRT reset timing without over-buffering builds that don't need a full H3.
Our AR-15 H2.5 Carbine Buffer (5.1 oz) is included in the Partisan Disruptor bundle for exactly this reason — it's the sweet spot for most carbine FRT builds.
Best for: Partisan Disruptor builds, mid-length gas FRT setups, shooters who found H2 marginal but H3 sluggish.
H3 Buffer — 5.4 oz
Three tungsten weights. Maximum weight in the standard carbine H-series. Recommended for FRT builds on carbine-length gas systems with barrels under 16 inches, or any build running a suppressor with an FRT. The additional mass provides the most dwell time — critical on shorter gas systems where the BCG moves faster.
Our AR-15 H3 Heavy Buffer (5.4 oz) uses tungsten weights and V2 reciprocating design.
Best for: FRT builds on carbine gas with barrels under 16", suppressed FRT builds, pistol-length gas builds running FRTs.
Buffer Weight by Build — Quick Reference
| Build Configuration | Standard Trigger | FRT Trigger |
|---|---|---|
| 20" rifle gas | Standard carbine / H1 | H2 |
| 16" mid-length gas | Standard / H1 | H2 / H2.5 |
| 16" carbine gas | H1 / H2 | H2.5 / H3 |
| 14.5" carbine gas | H2 | H3 |
| 10.5" pistol gas | H2 | H2 (ceiling — adj. gas block recommended) |
| Any length suppressed | H2 / H3 | H3 |
What Is a Reciprocating Buffer? (V2 Design Explained)
A standard buffer is a solid or segmented cylinder — weights stacked inside a fixed body. When the BCG strikes it, the entire buffer compresses the spring.
A reciprocating buffer — also called a V2 or self-regulating buffer — has weights that move independently inside the buffer body. As the BCG drives the buffer rearward, the internal weights travel forward inside the buffer, creating a counter-mass effect that partially offsets the rearward impulse.
The practical result:
- Reduced felt recoil — the counter-mass effect softens the felt impulse without changing the overall buffer weight
- Smoother cycling — the BCG decelerates more gradually rather than hitting a hard stop
- Self-regulating dwell — the reciprocating action helps the system adapt slightly to different pressure loads without manual adjustment
- Reduced bolt bounce — less chance of the BCG over-traveling and bouncing back before fully in battery
Our H2 and H3 buffers both use the V2 reciprocating design — you get the correct weight for FRT operation plus the smoother cycling characteristics of the reciprocating system.
The Silent Buffer: Eliminating Buffer Spring Noise
Every AR-15 has a buffer spring that rides inside the buffer tube. On a standard setup, that spring scrapes against the tube wall as it compresses and extends — creating the metallic grinding or "twang" you hear every time you rack the charging handle or fire a round. It's one of the most distinctive sounds of the AR-15 platform, and for many shooters it's annoying.
A silent captured spring system solves this by mounting the spring on a precision guide rod. Instead of the spring coiling directly inside the tube and touching the walls, it rides on the rod — no wall contact, no scraping, no noise.
TriggerSupply Silent H2 Buffer & Spring System
The TriggerSupply Silent H2 Buffer & Spring System combines both upgrades in a single all-in-one unit:
- H2 weight (4.6–4.7 oz) — the correct minimum weight for FRT trigger operation
- Captured spring on precision guide rod — completely eliminates buffer spring noise
- All-in-one design — buffer and spring ship as one assembled unit, installs in under 2 minutes
- Compatible with carbine AND rifle length buffer tubes — works in both configurations
- Reduced felt recoil and vibration — the guide rod system stabilizes spring compression
- Optimized for FRT builds — specifically paired with the Partisan Disruptor
At $99.99 it's $60 less than the JP Enterprises equivalent — which is the most direct competitor in the silent captured spring category.
Who it's for: Any shooter who wants to eliminate buffer spring noise, run a cleaner overall system, and get FRT-compatible H2 weight in a single drop-in unit. Especially valuable for suppressed builds where internal noises are amplified.
H2 vs H2.5 vs H3 — Which Should You Buy?
Buy the H2 if: You're running a mid-length or rifle gas system with an FRT, or any standard build wanting smoother cycling. The baseline FRT buffer for most 16"+ builds.
Buy the H2.5 if: You're running the Partisan Disruptor on a carbine gas system and want the sweet spot between H2 and H3. This is what ships in our Partisan bundle for a reason — it hits the timing window cleanly on the widest range of carbine builds.
Buy the H3 if: You're running an FRT on a carbine gas system with a barrel under 16", running suppressed, or you've tried H2 and still experience reset issues. Maximum dwell time — the safe choice for demanding builds.
Buy the Silent H2 if: You want FRT-compatible H2 weight AND want to eliminate buffer spring noise in one install. The all-in-one solution for shooters who want to clean up every aspect of their build.
Does Buffer Weight Affect Non-FRT Builds?
Yes, though the tolerances are more forgiving. Standard semi-auto triggers don't have the same strict dwell-time requirements as FRT triggers. But heavier buffers still benefit standard builds by reducing bolt bounce, softening felt recoil, and improving reliability with suppressed setups or when running lower-pressure ammo.
The reciprocating V2 design in particular benefits any build — not just FRT setups. Smoother cycling and reduced felt recoil are improvements any AR-15 owner will notice.
Complete Buffer Lineup
- AR-15 H2 Heavy Buffer — 4.6 oz V2 Reciprocating — $39.99
- AR-15 H2.5 Carbine Buffer — 5.1 oz — $29.99
- AR-15 H3 Heavy Buffer — 5.4 oz Tungsten V2 Reciprocating — $39.99
- TriggerSupply Silent H2 Buffer & Spring System — All-in-One — $99.99
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