Originally posted by sailing1801:
I use a plug made from a pliable magnetic strip that has a clear tape backing. I really don't know what it's called, got a roll of it at the hardware store. It's dark grey, looks like a stud post when it's fitted. Depth is just right, it fits flush with the gun's surface. I use a leather punch and press fit. The one on my 21 hasn't moved since I bought it a few years ago. I figure since I couldn't match the gun's color exactly, I'd use something that looks distinctly different, but that looks like it belongs.