CX4 RIFLE PX4 FOR 9MM/.40 MAGSBERETTA MAGAZINE WELL INSERTBERETTA MAGAZINE WELL INSERTCX4 RIFLE PX4 FOR 9MM . 40 MAGSFEATURES: This magazine well insert for the Beretta Cx4 carbine will allow the shooter to utilize Beretta PX4 pistol magazines The ability to use the same magazines in both the pistol & carbine is not only convenient, but also saves the shooter the expense of purchasing extra, model specific magazines for the carbine For 9mm . 40 Mags