I perfer anything in 45, but it depends on the situation. The Ar 15 is extreamly easy to use, but has to be kept clean. In Close quarters you run the risk of over-penatration. The 45 has a lot of knockdown power at close range, but fails at longer distance. In My opinion, have both and chose which fits the situation.
Beretta, e-gunparts.com, gun shows, gun shops, want ads.
The Beretta Storm. See related link.
Beretta CX4 Storm
The Beretta Cx4 Storm boasts a number of features, these include a retractable Picatinny rail and the ability to reverse ejection and extraction with no additional parts or special tools required.
Pistol caliber carbine.
Believe they will. See link below- and if in doubt, why not ask Beretta? They DO have a good customer servicedept.
Most gun dealers will tell you yes, as I have discovered that the majority of them are under the false impression that beretta 92 series mags fit the storm series guns. They do fit and lock in place, however they don't feed properly. The storm series mags are interchangeable between the Cx4 rifle and the Px4 pistols, so long as they are the proper caliber. Just because something fits doesn't mean it's right.....after all, why would beretta make specific mags for the Px4 if the existing mags from the 92 would do the job? Don't be fooled by a dealer who sticks a 92 mag in your gun and says "see? it fits!"
100-500 USD depending on specifics
9x19 Parabellum 9x21 IMI .40 S&W .45 ACP