Beretta Grip Frame for APX Centurion Beretta APX Compact Grip Frame, it's sold with three back straps: standard, small and large.
Details:
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) Compatible with Compact/Centurion uppers only. Not compatible with full-size upper.