The ones from Numrich/Gun Parts Corp (same company) are good to go.
I have a M39-2 and when I set the original factory mag with metal "X" follower next to the Numrich/GPC one, except for missing the S&W on the floor plate, it is dead bang identical. They really did an excellent job reproducing them.
Functioning has been flawless, I retired the factory mags to preserve them, and bought more of the Numrich ones.
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Conrad
SWCA #1830 SWHF #222
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