Beretta APX Grip Frame , it's sold with two additional back straps: thin and large size.
Unique modular chassis system allows replacement, reconfiguration, size tailoring, including:
Different sizes
Different color grip frames
Customization of the frame without destroying the gun (stippling)
OPERATOR BENEFIT
Ability to easily customize your APX; modifications like ?stippling? become less risky thanks to an easily-interchangeable frame. The break-down of the gun in its basic subcomponents also allows users to maintain their APX more easily.