Eh, I used to think mecGar made the mags too, not so sure now. The stock mag spring is thinner and has a different profile, and the mag body is shaped differently toward the base. MecGar mag springs are easily 30% stronger.
A few years ago i bought the +10% Wolff mag springs for the stock 15rd that came with my 75bd. It still had FTE issues until I just tossed them for the mecGar 16rd.
Every CZ i've owned has weak spring issues, including rifles. Wish they would get their act together.
Just my first hand observation.
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