LBE Unlimited Pistol Buffer Tube Assembly Kit - AR-15 / AR-308 Pistol Receiver Extension System, Precision CNC-Machined T6 Aluminum Tube, Standard Recoil Buffer, Heavy-Duty Music Wire Spring, Castle Nut & Latch Plate, Anodized Matte Black Finish - PBUFKT-BLK / 706612407717
Product Description
Building or tuning an AR pistol platform requires a precise, reliable recoil extension assembly to ensure proper cycling without BCG binding or short-stroking. Standard or out-of-spec receiver extensions can cause excessive bolt drag, battering of internal receiver walls, and irregular cycling on your bench. The **LBE Unlimited Pistol Buffer Kit (PBUFKT-BLK / 706612407717)** solves these cycling and receiver fitment bottlenecks, providing a complete, factory-matched recoil extension assembly housed in a precision-machined **T6 aluminum pistol tube** with a durable matte black anodized coat.
Proudly engineered and manufactured in the USA by LBE Unlimited, the PBUFKT-BLK kit contains every component required to complete the lower receiver tail assembly on your AR-15 or AR-308 pistol build. The round pistol buffer tube features a smooth outer diameter designed specifically for non-telescoping pistol receiver setups, preventing unwanted stock attachment while maintaining structural rigidity under rapid-fire gas impulses. Equipped with a standard 3 oz pistol recoil buffer, a heat-treated recoil spring, a steel castle nut, and a standard receiver end plate, this complete kit delivers factory-grade dwell timing and lockup directly from your armorer bench.
Engineered to thread natively into all mil-spec forged and billet AR-15 / AR-10 / LR-308 lower receivers, this complete pistol buffer kit guarantees smooth bolt carrier group travel and reliable cycling performance directly from your workspace bench.
*Armorer Bench Notes & Real-World Receiver Staging Guidance: The LBE Unlimited PBUFKT-BLK kit arrives workspace ready with all 5 essential buffer tail assembly components. LOWER RECEIVER & BCG COMPATIBILITY MATRIX: Engineered specifically for **AR-15, AR-308, and Pistol Caliber Carbine (PCC) lower receivers** stripped for pistol buffer extension tubes. *Thread Checklist:* Features standard 1-3/16"-16 UN threads compatible with all mil-spec AR lower receiver threads. Armorer Workbench Custom Staging Sequence: 1. Visually and physically confirm your lower receiver build is clear of ammunition and components on your bench. 2. Slide the receiver end plate and castle nut onto the threaded pistol buffer tube. 3. Thread the tube into the rear of the lower receiver until it catches the buffer retainer pin and spring. 4. Torque the castle nut to 38-40 ft-lbs using an armorer's wrench, then stake the end plate into the castle nut notch with a center punch. 5. Insert the recoil spring and 3 oz buffer into the tube until locked by the retainer pin before testing BCG movement.*
Key Features
- Complete 5-Piece Pistol Extension Kit: Includes pistol buffer tube, 3 oz recoil buffer, heavy-duty recoil spring, steel castle nut, and receiver end plate.
- Precision CNC-Machined T6 Aluminum: Constructed from high-strength aircraft-grade T6 aluminum for lightweight structural durability and impact resistance.
- Sleek Smooth Exterior Contour: Round non-indexing tube profile specifically engineered for dedicated AR pistol builds.
- Type III Hardcoat Anodized Matte Black Finish: Deep protective anodization shields aluminum against corrosion, surface scratches, and cleaning solvents.
- Mil-Spec Standard Thread Pitch: Uses standard 1-3/16"-16 UN threads for universal installation on all mil-spec AR-15 and AR-308 lower receivers.
- Factory Dwell & Recoil Calibration: Standard buffer and spring combination provides consistent bolt carrier group velocity and last-round lockup.
Product Specifications
- Brand: LBE Unlimited (United States / American Made Tactical Gear)
- Model Line: Complete AR Pistol Receiver Extension Kit
- MPN/SKU Code: PBUFKT-BLK (LBE Pistol Buffer Kit Black SKU)
- UPC Code Profile: 706612407717
- Firearm Platform Compatibility: AR-15, AR-10, LR-308, AR-9 Pistol Builds
- Tube Material Base: CNC-Machined Heavy-Duty T6 Aircraft Aluminum
- Exterior Finish Coating: Hardcoat Anodized Matte Black Finish
- Buffer Spec & Weight: Standard 3.0 oz AR Pistol Recoil Buffer
- Spring Material Spec: Heavy-Duty Heat-Treated Carbon/Music Wire Recoil Spring
- Thread Standard Pitch: 1-3/16"-16 UN Mil-Spec Lower Thread Pattern
- Full Kit Component Checklist: 1x Pistol Buffer Tube, 1x Recoil Buffer, 1x Recoil Spring, 1x Castle Nut, 1x Receiver End Plate
- Packaging Format Class: Factory Original Sealed LBE Retail Packaging
- Product Type Category: AR-15 Lower Receiver Components / Pistol Buffer Kits
- Net Component Mass: ~8.90 Ounces (~252.3 Grams Complete Kit Mass)
- Global Quality Certifications: Formulated to Rigid US Mil-Spec Dimensions & Tolerances
- Warranty Tracking Protection: Fully Backed by LBE Unlimited Factory Limited Warranty
