That is my "testing" triggerguard. Someone opened it for 378.

The thread on the loop measures to 10x32. Did anyone ever drill out the thread and put a cap screw in place.? Cheesy?

i have no idea what 378 stands for?
You have a lot of work to do to the bottom metal and need to locate the actual trigger to locate the guard placement. Then you can drill and tap for the 10/32 stud on the guard.

378 wea. mag. It won't fit in the stock but I can use it as a scrap piece.