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AR-15 Buffer Kits, Heavy Buffers & Buffer Tubes

The buffer system controls how your AR-15 cycles. NSPEC Innovations stocks H2 and H3 heavy buffers, the Odin Works HFRT 6.2 oz buffer kit built for forced reset triggers, folding and mil-spec buffer tubes, and complete stock and buffer tube kits. Tune the recoil system to your gas length, ammo and trigger.

Shop By Build Stage

Every Buffer Part, In Order

Start with the buffer weight your build needs, then the tube and spring, then the stock that mounts on it.

01

Heavy Buffers for Forced Reset Triggers

A standard 3 oz carbine buffer lets the carrier return to battery before a forced reset can engage. The Odin Works HFRT kit pairs a 6.2 oz 303 stainless buffer with a proprietary flat wire spring and was engineered for FRT and Super Safety use. Our H3 (5.2 oz) and H2 (4.6 oz) buffers are the next step down.

HFRT 6.2 oz Buffer Kit H3 Buffer 5.2 oz H2 Buffer 4.6 oz AR-15 Triggers
02

Standard & H1 Buffers

For a 16" carbine or mid-length 5.56 rifle running a standard trigger, the PSA Sabre S5 H1 buffer at 4.64 oz smooths recoil without over-weighting the system.

Sabre S5 H1 Buffer H2 Mil-Spec Buffer
03

Buffer Tubes

The Folding 6-Position Buffer Tube mounts to any rifle or pistol with a Picatinny rear backplate and folds to the left for compact storage. Standard mil-spec 6-position tubes come packaged in our stock kits.

Folding 6-Position Tube Folding Stock Adapter Gen 4
04

Stock & Buffer Tube Kits

Skip the parts list. The Minimalist Stock buffer tube kits bundle a skeletonized stock, mil-spec buffer tube, spring, buffer, castle nut and end plate in black or FDE.

Minimalist Stock V2 Kit Minimalist Stock Kit FDE Skeletonized Stock & Tube Buttstocks & Slings
Buffer System Anatomy

Weight vs. Timing

The buffer, spring and tube absorb bolt energy and push the carrier back into battery. Buffer weight is the main tuning knob.

Weights

Common Buffer Weights

  • Carbine (3.0 oz) Stock weight; fine for a standard 16" 5.56 carbine.
  • H1 (3.8 to 4.6 oz) Sabre S5 at 4.64 oz; smooths a slightly over-gassed rifle.
  • H2 (4.6 oz) Short barrels, suppressed use, entry point for FRTs.
  • H3 (5.2 oz) Pistol-length gas, 7.62x39, forced reset triggers.
  • HFRT (6.2 oz) Purpose-built for FRT and Super Safety cyclic speeds.
Parts

The Rest of the System

  • Buffer tube Mil-spec (1.148") or commercial (1.168") diameter; 6-position carbine.
  • Buffer spring Standard carbine spring or flat wire for consistent pressure.
  • Castle nut & end plate Lock the tube to the lower; stake the castle nut.
  • Buffer retainer Keeps the buffer in the tube when the upper is off.
  • Folding adapter Hinges the tube for compact storage; adds 1.3" length of pull.
Before You Order

Choosing the Right Buffer

Buffer weight depends on gas length, barrel length, ammo, suppressor use and trigger type.

Forced Reset Trigger

If you run a Super Safety or forced reset trigger, go heavy. The Odin Works HFRT kit is purpose-built; an H3 is the minimum. Symptoms of too light a buffer are bolt bounce, failure to reset and short-stroking.

Gas Length

Pistol-length gas over-gasses the system and wants an H2 or H3. Carbine-length on a 16" barrel runs well on an H1 or H2. Mid-length and rifle-length usually run on a carbine or H1 buffer.

Suppressed

Suppressors add back pressure and speed the carrier. Step up one buffer weight when you add a can.

Mil-Spec vs. Commercial Tube

Mil-spec tubes measure 1.148" and commercial tubes 1.168". Stocks are cut for one or the other; every stock kit here uses a mil-spec tube.

Picatinny Backplate Builds

Pistols and rifles with a Picatinny rear plate, such as some PCCs and AK-pattern receivers, use the folding 6-position tube instead of a threaded receiver extension.

Frequently Asked Questions

  • What buffer weight do I need for a forced reset trigger?

    Heavier than stock. A standard 3 oz carbine buffer causes bolt bounce and failure to reset. We recommend the Odin Works HFRT 6.2 oz buffer and flat wire spring kit, which was designed for FRT and Super Safety triggers, or at minimum an H3 (5.2 oz) buffer.

  • What is the difference between H1, H2 and H3 buffers?

    The weight. H1 is roughly 3.8 to 4.6 oz, H2 is 4.6 oz and H3 is 5.2 oz. Heavier buffers slow the carrier, reduce felt recoil and help with over-gassed, suppressed or short-barreled rifles.

  • Will a heavy buffer cause malfunctions?

    Too heavy a buffer on an under-gassed rifle can cause failures to lock back or short-stroke. Start with the weight matched to your gas length and step up only if the rifle is over-gassed or running an FRT.

  • Do I need a mil-spec or commercial buffer tube?

    Mil-spec tubes are 1.148" in diameter and commercial tubes are 1.168". Check your existing stock, or choose a mil-spec tube kit from this category and pair it with any mil-spec stock from our buttstocks and slings category.

  • What does the folding 6-position buffer tube fit?

    Any rifle or pistol with a Picatinny rear backplate. It is an impact-resistant polymer 6-position mil-spec tube that folds to the left side for storage.

  • Do buffers and buffer tubes require an FFL?

    No. Buffers, springs, tubes and stock kits ship directly to you in all 50 states with no FFL required.

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