This is the Magnum Sear made of heat-treated 410 stainless steel. It's perfected angles, rounded edges and polished surfaces produce the smoothest and most reliable function. It's harder, more durable wider than standard to eliminate unnecessary wobble. Just like our custom triggers, no shims or spring washers should be used. It leaves only enough clearance to work smoothly with the lightest sear springs. It produces a lighter, smoother trigger pull and cleaner hammer release. It fits Crosman models 1377C, 1322C, PC77, P1377, P1322, 2289G Backpacker, 2240, 2250, 2300T, 2300S, 2300KT, 2400KT, 1300KT and similar models that have the same type of trigger frame. It's too wide to fit the plastic trigger group for 2260, Discovery, Maximus and Fortitude models, It does fit the custom aluminum trigger casings we list for those rifles.