This is an original factory replacement part from Marlin. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts. Disassembly and assembly may be required and some parts may require installation by a qualified gunsmith.
This spring is intended for the Marlin models with longer magazine tubes. It will work in the shorter tubes, but may need to be altered slightly to allow for a full loading of the magazine.