AR 15 H3 Carbine Buffer

The AR 15 H3 Carbine Buffer delivers consistent recoil mitigation for carbine-length gas systems, engineered specifically for shooters who demand reliability under rapid fire. Precision-balanced for smoother cycling with heavier loads, this buffer eliminates bolt bounce while maintaining compatibility with standard carbine buffer tubes.

What you get

• H3-weight buffer (5.4 oz) for reduced recoil in carbine-length systems
• CNC-machined 4140 steel body with black oxide finish
• Three tungsten weights (vs. standard steel weights in H1/H2 buffers)
• Mil-spec internal spring dimensions (compatible with all carbine receiver extensions)
• Precision-rolled detent grooves for positive retention

Build and finish

The buffer’s 4140 steel construction undergoes stress-relieving heat treatment before machining to prevent warping under sustained fire. Rare Breed Triggers’ proprietary black oxide process creates a corrosion-resistant surface that maintains lubricity without the slickness of nickel plating, ensuring consistent performance in dusty or wet conditions.

Tungsten weights occupy the forward two-thirds of the buffer’s internal cavity, concentrating mass where it most effectively counters bolt carrier group momentum. The rear weight remains steel to maintain proper spring compression characteristics. Each weight floats independently in its own oil-retaining chamber, reducing harmonic vibration during cycling.

Compatible platforms

• AR-15/M4 carbines with carbine-length buffer tubes
• Pistol-caliber carbines (9mm/.40/.45) using Colt-style mag blocks
• AR-9 builds with blowback systems (recommended for +P loads)
• Polymer80 rifle-caliber frames with mil-spec lower parts kits

Installation notes

Drop-in replacement for standard carbine buffers – no modification required. Pair with a standard carbine action spring for optimal performance. When used in suppressed systems or with adjustable gas blocks, the H3 weight may require slight gas port adjustments to maintain reliable cycling.

For Polymer80 builders assembling compact rifle-caliber platforms, this buffer provides the ideal balance between recoil control and reliable feeding when paired with carbine-length gas systems. Its weight distribution complements the harmonics of polymer lower receivers, reducing felt vibration while maintaining positive lockup.