I got to shoot my friends CX4 chambered for 45 ACP what a blast a seriously fun gun to shoot surprisingly accurate too for a carbine in a pistol caliber at 50 yards it was shooting less then a inch groups shooting from a sand bag rest. The only down side was the magazines, 8 rounds BOOH!!!! they need make bigger magazines for it Im thinking like a 20 or 30 round mag that would be awesome.