An ENCOM .45 ACP "assault" pistol -- What a dog. An ugly, overweight dog -- which is weird, because it refused to eat anything....
AMT .380 Backup -- frustratingly unreliable, and unpleasant to shoot...
Glock (yes, a Glock!!!!) 21, .45 -- Jammed on me every 3rd or 4th shot. Blamed on limp-wristing.... never had a problem with any other Glock I've ever shot....
Ruger P97, also a .45, and also blamed on me limp-wristing... what is it with me and Limp-wristing? I've never had that problem with Sig 220's or 1911's...
The weirdest one? S&W 645. I bought it used from a police officer, who wanted something lighter. It was perfectly reliable for me -- until I myself went to work as a cop. Then, it started going downhill. I would take it into the armorer, he'd fix it, it would shoot fine, and I'd qualify... then it started jamming again. This cycled continued during my time in blue. In frustration I purchased a Glock 17 to replace it, but then I moved on to other things. Since I quit doing the cop thing, that darn pistol has NEVER jammed on me since. Really. True story.