Stevo,

The base I ordered is the same one as the Enforcer's base which is the police modified Envoy. It only needs 2 screws to attach the front base, the rear base is held like a normal Enfield Rear sight.

As for its value or lack there of cause of a modification, I don't forsee too much of a problem, will be holding onto this rifle for a long time. Will probably get old and give it away to my grandkids or something.

Dimitri