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Old March 11, 2013, 08:14 PM   #4
oldgunsmith
Senior Member
 
Join Date: January 9, 2013
Posts: 278
That's usually caused by a cartridge stop or interrupter not doing it's duty. Letting a shell out of the magazine at the wrong time. They can either not let one out at all, drop one on the ground and feed another one into the chamber at the same time, or drop one and not feed one. If you look close you can see that one is just forward of the other. The rearmost one lets one shell out at just the right time while the forward one holds the rest in the magazine. If you watch closely as you feed DUMMY AMMO through it you can see which is which and which isn't doing it's duty.
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