Michael,
What symptoms is your luger exhibiting that leads you to think it is short stroking? The reason I'm asking is that in lugers, a mainspring that is too weak can exhibit behavior that in other guns would be a sign of short stroking. If the mainspring is too weak (or ammo too hot) a luger can fail to lock open or fail to pick up a round from the magazine because the action is cycling too quickly.
Anyway, just wondering about what you are seeing....
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