I did notice that Seymour and Sparks-Withington (SWCO) magazines fit and locked up just fine, but that the feed lips on Crosby-made mags seemed to flare too much at the top front. The Crosby-made mags (five total; all with same problem) would not lock into position. All mags tried were in original new or nearly new condition, and all work just fine in my '28A1.
Anybody else having the same problem? Fixes that won't effect feeding?
Thanks and best regards!