Michael

Promo makes a very good point. If you're planning on making a replica then good luck to you, especially if it's to use with a rifle and originals are scarce, but marking it in such a way so as to not confuse with an original is a great idea, particularly as so little info is out there. It's hard enough gleaning knowledge about the few original ones without confusing any future interested parties with replicas!
ATB
Kev