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Geissele Automatics, Buffer Tube Complete Assembly, Fits AR-15, Anodized Finish, Black, 6-Position, H2 Buffer, Super 42 Spring - SKU: 08-163B-H2 - UPC: 817953026984
Product Description
The Geissele Automatics Premium Mil-Spec Buffer Tube Complete Assembly in Black (08-163B-H2) is an all-in-one recoil management system engineered for AR-15 rifles and carbines. Precision-machined from 7075-T6 aluminum with a Type 3 Hardcoat Anodized black finish, this 6-position extension tube is paired with Geissele's legendary Super 42 Braided Wire Spring and an H2 heavy buffer (4.7 oz) to dramatically improve cycling smoothness, mitigate felt recoil, and enhance overall firearm reliability.
At the core of this assembly is Geissele's proprietary Super 42 spring design. Inspired by the German MG42 machine gun, the triple-wire braided construction dampens vibrational energy, eliminates the annoying spring "ping" noise inside the buffer tube, and stores more energy than standard round-wire springs. Combined with the H2 tungsten weight buffer, this kit slows bolt carrier velocity to prevent over-gassing, reduces wear on internal components, and ensures positive feeding across suppressed, short-barreled, and hard-use carbine platforms.
Complete with a heavy-duty mil-spec castle nut and endplate, the Geissele 08-163B-H2 buffer tube assembly features extended receiver threads and precise interior dimensions that prevent buffer tilt and premature tube erosion. Whether upgrading a duty rifle or staging a custom suppressed build, this premium buffer system delivers unmatched longevity and smooth recoil execution.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Direct fit for standard AR-15 lower receivers. The H2 buffer (4.7 oz) with Super 42 spring is optimized for carbine-length gas systems, mid-length setups, short-barreled rifles (SBRs), and suppressed shooting.
- Verify host AR-15 lower receiver is completely clear, magazine removed, safety engaged, and chamber confirmed empty.
- Thread the castle nut (smooth side forward, notches facing rearward) and endplate onto the 7075-T6 buffer tube threads.
- Insert the rear takedown pin detent spring into the lower receiver channel, ensuring the endplate compresses the spring flush without binding.
- Thread the buffer tube into the lower receiver until it retains the buffer retainer pin and spring, then torque castle nut to 38-40 ft-lbs using a mil-spec armorers wrench.
- Stoppage/Staking Step: Stake the endplate into the castle nut notches in two places using a center punch to prevent backing off under recoil. Install Super 42 spring and H2 buffer until retained by the detent.
Key Features
- Super 42 Braided Wire Spring: Triple-strand braided wire design absorbs recoil energy and eliminates harmonic spring vibration noise.
- H2 Heavy Buffer (4.7 oz): Includes tungsten weight tuning to reduce carrier bounce, smooth out recoil impulse, and control over-gassed barrels.
- 7075-T6 Aluminum Extension Tube: Machined from ultra-strong 7075-T6 aluminum with 6 stock positioning detents.
- Type 3 Hardcoat Anodized Finish: Heavy-duty matte black finish resists corrosion, carbon buildup, and harsh environmental wear.
- Complete Mil-Spec Assembly: Includes 6-position buffer tube, Super 42 spring, H2 buffer, mil-spec castle nut, and receiver endplate.
- Made in the USA: Built to Geissele Automatics' strict military-grade tolerances and performance standards.
Product Specifications
- Brand: Geissele Automatics
- Model: Premium Buffer Tube Complete Assembly w/ Super 42 & H2 Buffer
- MPN: 08-163B-H2 / 08163BH2
- SKU: 08-163B-H2
- UPC: 817953026984
- Platform Compatibility: AR-15 (Mil-Spec Lower Receivers)
- Positions: 6-Position Mil-Spec Diameter
- Buffer Weight: H2 (~4.7 oz)
- Material: 7075-T6 Aluminum / Stainless Steel Spring
- Finish/Color: Type 3 Hardcoat Anodized Black
- Country of Origin: USA
