If the situation between the 411 and 410 is the same as between the 915 and 910, the 10-round version of the 9 mm guns had a plastic guide rod and sights and less complex milling of the metal parts than the earlier 15-round model. I don't have a 411 or 410 but I would guess similar changes occurred.
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Alan
SWCA LM 2023, SWHF 220
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