The ELF Match Pro Trigger has been built for performance. This trigger has an adjustable pull weight between 2.75 lbs and 4 lbs. The Elf Match Pro Trigger is identical to the Match Trigger with the addition of a proprietary threaded mounting system. The combination of aerospace grade sealed bearings, precision ground threaded bushings, and screws instead of traditional pins provide a rock-solid trigger system. Since their inception, AR platforms have always used pins to mount the trigger and hammer in the lower receiver. Because pins require some ""play"" in order to be installed, there is always a little play in the trigger system. This new threaded system Mfg: Elftmann