Leapers UTG PRO 1.2" outside-diameter AR-15 pistol receiver extension - the buffer tube that anchors your carbine buffer, action spring, and (for pistol builds) a pistol brace or bare buffer stack. Precision-machined from 7075-T6 aircraft-grade aluminum with a Type III Class II hard-coat anodized finish and a dry-film-lube-coated interior for smoother buffer cycling. Specs & features: 1.2" outside diameter - pistol/bare-tube profile (not stock-body diameter) 7075-T6 aluminum, precision-machined Type III Class II hard-coat anodized, matte-black finish Dry-film-lube coated interior for smooth buffer travel Accepts standard AR-15 carbine-length buffers and action springs (sold separately) Fits standard AR-15 pistol lower receivers and end-plate stacks Fitment: AR-15 pistol lower with a carbine-length buffer stack. This is a bare pistol tube - pair with a carbine buffer + action spring + end plate + castle nut to complete the build. Not for rifle-length tubes or AR-10 platforms. Verify your lower is threaded for a carbine-length extension before install.