I have the Walther P22 jam o matic. have well over 500 rounds through it. Still waiting for it to "break in". Not all Semi auto's jam, not all revolvers are 100% reliable.
I have a 40 S&W revolver that uses moon clips. if the bullet is not set correctly in the clip it will jam the cylinder. I have also had a jam in a revolver caused by a primer sticking out a bit too far.
I have a Ruger SP101, in 357Mag, but usually carry a Ruger SR9c.
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