This is an original factory replacement part. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts which guarantees excellent fit and reliable operation. Disassembly and assembly may be required to replace part. Some parts may require installation by a qualified gunsmith. The trigger offers a "drop-in" replacement trigger assembly that is compatible with all Ruger 10/22 rifles and 22 Charger pistols.