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I assume that you are talking about locking back the slide while you still have ammo in the magazine. they should work just like the 17 round mags I suggest that you take a follower out of the 17 round mag and try it in the 20 round mag. I would also try shooting the 20 rounders with 10 rounds in them and see if it still has the problems ( to strong spring). You can also load 20 rounds in them and let them sit for a while to loosen the springs other that that I suggest call in Beretta to ask for any insight on the problem Beretta contact 1 8002373882

You are operating correctly Marc. This sounds like some slightly out of spec magazines that sit slightly higher and is prematurely engaging the slide lock on the pistol. I would give Beretta a holler for advice/resolution or possible replacement at 1-800-BERETTA extension 2003.