<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by 4V50 Gary:
Ruger uses guages to check the length and width of the magazine, spread of the lips and also height of the lips.[/quote]
I bought a horde of USA Magazines once and found that all I had to do was use a little judicious work with a file, vice, and calipers to get them to work just as good as the Rugers. There's also the little divit cut out of the forward end of the Magazine that acts as a Feed Ramp of sorts. I ground that with a dremmel. I used my Vice with dowels to close up the magazine first so that it was the right width. Then I adjusted the height (of the lips above the rear and front magazine latches). I followed this by tweaking the lips a bit and then filing where necessary. Finally, I cut the little feed ramps in the front of the magazine and polished up the whole deal. It takes about fifteen minutes per magazine and they all fed flawlessly.