The Mauser was the first inspired design by John Huber. As not to reinvent the wheel John chose to modify those components related to functions that needed to be improved while not altering the original awesome design of Paul Mauser. Is considered open architecture where a single piece replacement is the proper choice. Does not affect the safety functions. Minor wood relief is necessary but not fully through to the floorplate. Fit and function from 1892 forward through M96, 98K, Yugo M48, and other Mauser pattern rifles. Two stage service match or single stage match grade, drop-in with OEM sear, spring, and pins. There are 3-4 adjust ability which are creep, over travel, and staged break balls. Typical installation takes about 15-30 minutes.