No evidence of tumbling. Other users report acceptable accuracy, I honestly think a lot of my issues with the 21a lie in the size of the pistol - it's a struggle to curl my finger far enough to press the trigger while trying to keep the web of my hand below the slideBut, its decently reliable and quite fun to shoot.
I read a lot of recommendations for Stingers or Velocitors in the 21a. I consider mine an interesting plinker, so even reliable standard velocity rounds are fine for me.
Andy
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