Rock Island Armory 1911A1 Tac Ultra AOS Features The Rock Island Armory 1911A1 Tac Ultra AOS is built on a steel frame with a 5.05 inch barrel and a 1:16 inch twist rate delivering the classic single-action feel 1911 shooters have relied on for over a century. Its adjustable trigger allows shooters to tune the pull weight between 4 and 6 pounds to match personal preference giving a level of customization not found on a standard GI-pattern 1911. The slide s AOS optic plate system uses Glock-pattern front and rear sight cuts and accepts a variety of optic mounting plates letting shooters run the red dot of their choice. Aggressive slide serrations improve grip during manual manipulation whether racking the slide under stress or performing a routine press check. The frame and slide are finished in manganese phosphate parkerizing a durable corrosion-resistant treatment well suited to a duty or range pistol that sees frequent use. G10 grip panels replace traditional wood or rubber grips providing an aggressive weather-resistant texture that holds up in wet or sweaty conditions. An ambidextrous thumb safety accommodates both right- and left-handed shooters while a integrated magwell speeds up reloads under time pressure. With a Picatinny accessory rail molded into the dust cover the Tac Ultra AOS gives shooters the option to add a weapon light for low-light use rounding out a well-equipped optics-ready 1911 package. Rock Island Armory 1911A1 Tac Ultra AOS Specifications Brand: Rock Island Armory Model: 1911A1 Tac Ultra AOS Type: Single Action Pistol Caliber: .45 ACP Barrel Length: 5.05 Twist Rate: 1:16 Capacity: 8+1 Frame: Steel Grips: G10 Trigger: Adjustable 4-6 lbs Sights: Glock Pattern Front/Rear Safety: Ambidextrous Thumb Finish: Manganese Phosphate Parkerized Weight: 2.5 lbs Available At: GrabAGun