The problem could also be, in part, in the repo side plate, if that is what you mean by "sliding trigger plate". You can always try a Wolf spring kit, most large gun smiths will carry one, or they are available from Brownell's.......you know when I say "large gun smiths", I mean gun smiths who have a good inventory of supplies, not over weight gun smiths.....can you try a good original Luger mag, and see if that works?
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