I have a nice-looking KKJ in 22 LR on the way. Everything looks good but there is some finish loss on the trigger guard. I'm inclined to leave it as is, but I am interested in knowing what it and the front sight base are made of. I'm guessing some sort of aluminum/zinc alloy. Also, is Earl's pretty much the go-to place for a spare magazine and any parts/repairs I might need down the road? Thanks in advance.