Out of my range experience (mainly with 1911 GLOCKs and CZ) I had stovepipes when my loads were too light fo the recoil spring or the recoil spring too heavy, or problems with the extractor (worn extractor hook, tension too high); I had failure to feed generally when I had faulty magazines, but could be caused also by too much extractor tension, or worse still a barrel somehow throated imroperly.
Sergio
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"Originality can't be restored and should be at the top of any collector's priority list.
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