I was pretty sure they wouldn't, That's case positive number one and probably why the 9x18 mak disappeared. I would say that she is not alone and many others have purchased 9x18 only to find they can't shoot em.jrwhit, a mak case will not fit in a 9mm luger gun. they go in the mag fine, but will not chamber. The bullet is fatter. I know because a gal next to me at the range jammed her gun up good trying to do that. Moron at academy had given her mak shells when she asked for 9mm bullets, and neither knew better.
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