The APX Compact pistol extends the proven APX Series to a concealed carry friendly size. It features a 13+1 (9mm) or 10+1 (.40 S&W) flush fit magazine and can accept the Full/Centurion size APX magazines as well. As with all APX pistols, the Compact has been designed specifically for military and law enforcement users who have a need to carry concealed but want similar handling characteristics to their duty pistols.
The APX Compact features an end user removable serialized chassis and can be easily modified with replaceable grip frame housings. Controllability and ergonomics are an APX focus: Low bore axis, ambidextrous slide catch, reversible magazine release, aggressive slide serrations, and a trigger that breaks at 6 lbs with a clear tactile and audible short reset
http://www.beretta.com/en-us/apx-compact/