The CZ 550 fits most centerfire calibers. It is adjustable from 1 – 3.5lbs. It is also adjustable for sear engagement (creeep) and the overtravel is mechanically limited. Each trigger is tested and calibrated in our factory on a standard production Model 550 action and is set to approximately 3lb, with virtually no creep. All components are manufactured on CNC machines to maintain tolerances of +/- .001. The housings are made of aircraft grade 6061-T6 alloy, while the triggers are machined from solid billet. All wear surfaces are hardened and polished to ensure a lifetime of trouble free operation.