These lower ends have to be destroyed if they have a number on them or if they don't. I do not think they exist. Get a gun and checker it. Do the long lines first and use the side of the vice as a guide. Then do the short lines across and after you get the lines in both ways, clean them up with a single line file. "Faint Heart never Won Fair Maiden." Needless to say you have to have the frame stripped down except for the PT. (Plunger Tube). That is the way I started and each one got better for quite a while. After about 100 of them, you should be pretty fair. Go get 'em, Chris! If you need help, call me!