Barrel: 416R Stainless steel. Chambered in 6.5 Grendel, with a 1:8 twist, M4 barrel extension, and a rifle-length gas system. Barrel is finished off with a PSA 15" Lightweight M-Lok free float rail, .750 adjustable gas block, and A2 flash hider. Upper: Forged 7075-T6 A3 AR upper is machined to MIL-SPECS and hard coat anodized. These uppers are made for us right here in the USA by a mil-spec manufacturer. Bolt: Full-auto profile bolt carrier group. 9310 steel bolt, Shot Peened, Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. 8620 steel M-16 profile carrier is nitride treated. Vortex Sonora 4-12x44 Riflescope w/ Dead-Hold BDC Reticle The Vortex Sonora redefines what a rifle scope can do. The Sonora combines fully multi-coated lenses for a clear sight picture with generous eye relief. The Sonora also features a hard-anodized, single-piece, aircraft-grade aluminum tube that is nitrogen purged and O-ring sealed that delivers a waterproof, fog-proof, weatherproof performance no matter the weather. Features: Anti-reflective lens coatings increase light transmission for greater clarity Gas purged and o-ring sealed delivering waterproof and fog-proof performance Waterproof performance designed to withstand harsh weather conditions The shockproof, rugged construction withstands the highest levels of recoil and impact Specifications: Reticle: Dead-Hold BDC Tube Size: 1" Length: 13.5" Weight: 15.8 oz. Eye Relief: 4" Field of View: 24.7'-8.4' @ 100 Yard Adjustment: 1/4 MOA Travel Per Rotation: 15 MOA Total Windage Travel: 60 MOA Total Elevation Travel: 60 MOA Vortex Cantilever Ring Mount For 1" Tube with 2" Offset Use this cantilever mount for mounting 1-inch telescopic sights onto flattop style AR-15 rifles. The 2-inch offset of this cantilever mount positions the scope in a forward location, allowing the correct eye relief and head placement on an AR-15. Aluminum construction. Features: The cantilever ring mount positions the center of the riflescope tube at a height of 1.59 inches (40.39 mm) from the base. Specifications: Model: CM-102 Mount Style: Cantilever Offset: 2" Rings: 1" Weight: 6.7 oz. Ring Screw Torque: 16 inch/lbs Base Screw Torque: 20 inch/lbs #html-body [data-pb-style="62DF828B0E8B1"]{justify-content: flex-start; display: flex; flex-direction: column; background-position: left top; background-size: cover; background-repeat: no-repeat; background-attachment: scroll; border-style: none; border-width: 1px; border-radius: 0px; margin: 0px 0px 10px; padding: 10px;}#html-body [data-pb-style="62DF828B0E8BE"]{border-style: none; border-width: 1px; border-radius: 0px; margin: 0px; padding: 0px;}