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RBid · January 27, 2013, 08:43 PM

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.

January 27, 2013, 08:43 PM	#4
RBid Senior Member Join Date: March 10, 2012 Posts: 1,059	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. __________________ Currently Own: Beretta PX4 9mm, Glock 23 (Gen 4), Glock 19 (Gen 4) x2