"The gun has at least 300,000 rounds through it and is usually extremely accurate."
Maybe that nature's trying to tell you something.
Seriously though,it should be a process of elimination seeing as it has worked
so well so long,try removing that rubber part which you say is new,the pistol
doesn't need it anyway.Then minus the recoil spring see if you can notice where it binds, I'd be looking also at a damaged slide stop or a bent plunger lever,
is the disconnector moving free?good luck
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