I suspect the G21 slide is heavier and has a lower bore axis than my 97. Certainly the recoil impulse was there, but it was more of a straight back push, and the mild reloads literally dropped cases right at my feet. The CZ tosses them about 8' to the right and I have to go police them during colds.
All the CZ boards and even Wolff recommend the 16# spring.
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