AR-15 trigger systems have gotten better and better over the years, allowing rifle owners to be more accurate and precise with their platform of choice than ever before. The Midwest Industries Enhanced Drop-In Curved Trigger is a single-stage design that's at the top of its class, and it's easy to install and use. Designed for all small-pin AR-15 lower receivers with pin diameters of .154", the Midwest Industries Enhanced Drop-In Curved Trigger features a 3.5-pound pull weight combined with an incredibly smooth, clean break. The trigger is outfitted with a short reset and minimal overtravel to allow shooters to speed up their shots. All the internal components of the unit are machined from S7 tool steel, complete with black-nitride finishing. The components are housed in an aluminum cassette housing treated with a blue anodized finish, and the housing fits into most AR-15 and AR .308 lower receivers. A 60-degree and 90-degree selector option is available. Midwest Industries warns users not to tamper with the center set screw in the trigger design.