1018 to start, might go with 8620 at some point but that will require a bit more machining time as it is only readily available in round bar and would need to be made rectangular for the EDM process. This is not meant to be an inexpensive fix for a shooter grade gun. I do not expect to be doing these on shot out Trojan grade guns. If you happen to own a higher grade gun, you may or may not feel this would be a service that is of value.
Steve


Firearms imports, consignments


[Linked Image from i.imgur.com]