A buddy of mine had a chrome moly barrel welded to remove both vertical and lateral movement. Small spots of weld were placed at about 1:30 and 10:30 in the first slot, a la the Kart ez fit barrel. These were then filed by hand so that the barrel was centered in the slide, and riding on the slide stop pin. It won't work to take up much slop, as you are forcing the barrel down onto the slide stop, so you have to have plenty of lug engagement to begin with.
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