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CZ Kadet-once I had about 500 rds. through it. Next in order of reliability:
Beretta 76
High Standard Citation
GSG 1911
Beretta Neos
Norinco M-93
S&W 41
Ruger MK111 Hunter
Sig 220 22 Classic S/A
Sig Mosquito only with Thunderbolts
I've Got to give the vote to the Buckmark. Never had any hiccups with any brand of ammo except a couple of FTF's with cheap bulk ammo. Perhaps there wasn't any powder in the bullet!