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Old January 27, 2013, 08:43 PM   #4
RBid
Senior Member
 
Join Date: March 10, 2012
Posts: 1,054
They're interchangeable unless you switch the mag release on the Gen 4 to the left. Then the Gen 4 won't accept older mags.

I have a new mag in my Gen 3, as I type this.
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