Installation instructions for this piston part #NLG-1800. some of the piston holes in the operating slide guide assemblies can have a build up of rust and residue in the bottom hole and this makes it difficult to seat the piston all of the way to the bottom. We suggest you clean out the hole with a cleaning brush and Hopp's #9. In some cases there is a sever build up of these foreign materials, then use a 1/2 chucking reamer to clean out the bottom of the hole.
SAFETY WARNING-all parts should be installed by a qualified gunsmith.
WARNING! Make sure all firearms are unloaded when installing parts