Key question.Does it extract an unfired shell?
If the 11b, it should not (part of the extractor acts like a spring).Yes it will extract rounds done manually and the gun has the 11b style extractor thats on the parts list on numrich. Does that extractor need a spring.
For what it's worth I have one of these and it does the exact same thing. I've broken it down several times, oiled it each time, but every other magazine load almost always stovepipes o e or two. Shooting brass from several manufactures doesn't seem to make a difference. Slide is smooth and springs feel good. I asked my dad about it(original owner) and he said it did this from day one. As it was a gift for my mom who prefers a revolver it was left as-is for several years. When it works it is fun to shoot and like like to get it fixed up for my girlfriend. If you come across a solution I'd love to hear about it!Im pretty sure its something with the extractor or chamber. The slide does go all the way back the the round stays half way in the chamber on stuck on the breech face half way ejected