Spike's Tactical Mil-Spec 6-Position Carbine Buffer Tube Assembly Kit with ST-T2 Heavy Buffer - SLA500R-K
Product Description
An AR-15 rifle's ultimate reliability and cycling smoothness are anchored directly within its internal recoil management loop, yet the receiver extension matrix is frequently compromised using substandard parts. Cheap commercial buffer tubes are often machined from soft 6061-T6 extrusions with rough internal tooling marks, causing premature carrier tilt, rough grit noises, and standard loose-weight steel buffers that bounce erratically inside the track. This internal rattling and inconsistent bolt carrier group (BCG) speed induces cycling hiccups, accelerated wear on the receiver lugs, and excessive muzzle rise during rapid tracking strings. The Spike's Tactical Mil-Spec 6-Position Buffer Tube Assembly Kit completely eliminates these weak links, deploying high-end aerospace metals and a revolutionary dampened counterweight system to deliver a smooth, high-performance mechanical cycle.
Precision-milled from a heavy-duty impact extrusion of premium 7075-T6 structural aluminum alloy, the 6-position buffer tube delivers exceptional tensile integrity that prevents thread stripping or warping under intense field conditions. The exterior is coated with a uniform MIL-SPEC Type III hardcoat anodized shell, while the precision-bored interior tracking channel is treated with an advanced dry-film lubricant layer to permanently suppress friction and harmonic action spring noise. Rather than using standard steel weights that slosh loosely back and forth, Spike’s includes their legendary ST-T2 heavy buffer. Packed with high-density, fine tungsten powder, the ST-T2 acts as a fluid dead-blow hammer that completely neutralizes bolt bounce, slows the extraction cycle to a safe velocity, and completely silences the distracting mechanical rattle common to traditional carbine buffer setups.
In physical live-fire applications, this factory-matched system works seamlessly to flatten your rifle's recoil profile and maximize follow-up tracking response times. The assembly features clear laser-engraved position index numbers along the top alignment spline, enabling instantaneous, positive length-of-pull settings to accommodate thick plate carriers, cold-weather apparel, or distinct shooting positions. Driven by a premium 17-7 PH stainless steel wire compression spring that retains its uniform elasticity through thousands of intense operational heating cycles, this kit provides smooth, clean cartridge striping and rock-solid bolt lockback. It stands as the premier structural bridge for shooters looking to finalize a stripped lower receiver project or optimize a suppressed tactical build for long-term failure-free performance.
*Armorer Bench Notes & Technical Maintenance Guidance: The Spike's Tactical SLA500R-K assembly features a strict Mil-Spec outer diameter of 1.148 inches, meaning it interfaces perfectly with premium mil-spec collapsible stock bodies from brands like Magpul, BCM, and B5 Systems, but will not slide onto commercial-diameter stock configurations. During installation, take special care that the extended front lip of the buffer tube pins down the outer shoulder of the spring-loaded buffer retainer plunger without binding its mechanical travel against the internal receiver wall. Secure the high-carbon steel castle nut firmly to 38–42 ft-lbs using a dedicated three-notch armorer's wrench. It is vital to stake the end plate into the castle nut index notches at two distinct locations with a center punch and hammer to physically lock the receiver extension against the heavy counter-recoil harmonics of the platform. Keep the dry-film inner channel clear of wet aerosol oils; a simple clean dry patch wipe-down is all that is required during preventative maintenance cycles.
Key Features
- Monolithic 7075-T6 Buffer Tube: Meticulously machined from premium structural-grade aluminum alloy to maximize thread integrity and survive punishing drop-free field impacts.
- ST-T2 Tungsten Powder Buffer: Filled with advanced high-density tungsten powder that shifts weight dynamically to completely banish bolt bounce, cushion extraction velocity, and eliminate standard rattle noises.
- Dry-Film Internal Lubrication: Muzzle channel is permanently lined with an advanced anti-friction dry film coat to smooth out carrier glide and damp out harmonic spring screech.
- 17-7 PH Stainless Steel Spring: Driven by an exceptional mil-spec electro-polished stainless steel spring that holds its factory compression rate indefinitely under abusive heat cycles.
- Laser-Engraved Position Marks:Milled indexing numbers are cleanly etched onto the alignment track to permit lightning-fast length-of-pull reference configurations under changing field conditions.
Product Specifications
- Brand: Spike's Tactical
- Model Line: Receiver Hardware Completion Group
- MPN/SKU: SLA500R-K
- UPC: 855319005211
- Tube Diameter Type: True Mil-Spec Standard (1.148" Outer Diameter)
- Adjustment Lanes: 6-Position Adjustable Alignment Spline
- Buffer Specification: Spike's ST-T2 Heavy Buffer (~4.0 oz, Tungsten Powder Filled Body)
- Spring Construction: 17-7 PH Electro-Polished Stainless Steel Wire
- Tube Finish: MIL-SPEC Type III Class 2 Hardcoat Anodized (Matte Black) w/ Internal Dry-Film Lining
- Kit Materials: 7075-T6 Aluminum / Hardened Carbon Steel Cast Nut & Plate / Stainless Steel Spring
- Country of Origin: United States
