Product DescriptionThe CMC Triggers AR-15 Standard Buffer Assembly (Mil-Spec) is a complete buffer tube assembly kit designed to mount a Mil-Spec stock onto your AR-15 lower receiver. The 6-position receiver extension is machined from 7075-T6 aluminum to Mil-Spec dimensions and finished with a Type III, Class II hard coat anodize for durability. Built for hard use, the buffer tube includes through drainage holes to help evacuate water in submerged environments. The kit also includes a machined high-carbon steel castle nut and quick detach (QD) end plate that are heat treated and nitride finished for strength and corrosion resistance, plus a standard 3 oz carbine buffer and high-tensile steel carbine action spring.Product Highlights Complete Mil-Spec AR-15 carbine buffer tube assembly kit for mounting a stock to a lower receiver 6-position receiver extension made from 7075-T6 aluminum with Type III, Class II hard coat anodized finish Through drainage holes help evacuate water for use in wet/submerged environments Heat-treated high-carbon steel castle nut and QD end plate with nitride finish for durability and corrosion resistance Includes standard 3 oz carbine buffer and high-tensile steel carbine action springSpecs Brand: CMC Triggers Manufacturer Part Number: 81626 UPC: 859464006987 Platform Compatibility: AR-15 (Mil-Spec stocks) Receiver Extension Positions: 6-position (carbine) Receiver Extension Material: 7075-T6 aluminum Receiver Extension Finish: Type III, Class II hard coat anodized (black) Drainage: Through drainage holes Buffer: Standard carbine buffer, 3 oz Spring: Carbine action spring (high-tensile steel) Included Hardware: Castle nut (high-carbon steel), QD end plate (nitride finished)Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.