Primary Weapons Systems MOD 2 H4 6.8 oz Enhanced Carbine Buffer - SKU: EBUFFER-H4 - UPC: 811154033703
Product Description
The Primary Weapons Systems (PWS) MOD 2 H4 Enhanced Carbine Buffer (EBUFFER-H4) is a heavy-duty, suppressor-tuned recoil buffer engineered to optimize cycling reliability in over-gassed and suppressed AR-15 carbines. Weighing in at a heavy 6.8 ounces, the H4 is the heaviest carbine buffer in the PWS MOD 2 lineup, specifically designed to slow down high bolt carrier velocities caused by backpressure from sound suppressors.
Precision-machined from 4140 heat-treated steel, the MOD 2 buffer body features a unique fluted outer profile with reduced contact geometry. These minimal contact channels allow carbon fouling, unburnt powder, and oil debris to clear easily inside the receiver extension, preventing binding and slowing during high round-count strings. The entire steel body is treated with a Ferritic Nitrocarburizing (FNC) LIFE HD salt bath nitride finish, creating a hard, self-lubricating, and highly corrosion-resistant surface.
By increasing mass and prolonging barrel dwell time, the PWS H4 buffer eliminates bolt bounce, mitigates felt recoil impulse, and stabilizes ejection patterns without altering your rifle's primary gas settings.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits standard mil-spec and commercial AR-15 carbine-length receiver extensions (buffer tubes). Optimized for suppressed 5.56 NATO, .300 AAC Blackout, SBRs, and severe over-gassed carbine systems.
- Verify host carbine is completely clear, magazine removed, and chamber visually and physically confirmed empty.
- Depress the rear buffer retainer pin inside the lower receiver and remove the existing buffer and buffer spring.
- Inspect internal receiver extension tube for excessive dry fouling or grit; wipe clean with a cloth.
- Insert the PWS MOD 2 H4 buffer head-first over your carbine recoil spring, ensuring proper spring seat capture.
- Depress buffer retainer pin, slide assembly into tube until retained, and perform manual bolt cycles to verify smooth stroke and lockup.
Key Features
- Suppressor-Tuned 6.8 oz Mass: Heavyweight H4 profile slows bolt velocity and controls timing in high backpressure suppressed setups.
- Fluted Steel Body Design: Machined channels reduce contact friction and allow carbon and oil debris to bypass smoothly.
- 4140 Heat-Treated Steel Construction: Solid steel body construction resists deformation and wear under severe operational impact.
- FNC LIFE HD Nitride Finish: Salt bath nitrocarburized surface treatment chemically locks in lubrication and stops corrosion.
- Drop-In Carbine Upgrade: Direct replacement for factory AR-15 carbine buffers with no special tooling required.
- Eliminates Bolt Bounce: Heavy reciprocating mass maintains positive bolt lockup and reduces felt recoil impulse.
Product Specifications
- Brand: Primary Weapons Systems (PWS)
- MPN: EBUFFER-H4
- UPC: 811154033703
- Weight Class: H4 Heavy Carbine Buffer
- Actual Mass: 6.8 oz / 192.7 g
- Material: 4140 Heat-Treated Steel
- Finish: FNC LIFE HD Salt Bath Nitride (Black)
- Platform Compatibility: AR-15 / Carbine Receiver Extensions
