Beretta APX Compact Grip Frame, it's sold with three back straps: standard, small and large
Features
Unique modular chassis system allows replacement, reconfiguration, size tailoring, including:
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Different sizes
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Different color grip frames
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Customization of the frame without destroying the gun (stippling)
Will fit
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APX Centurion (All calibers)
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APX Compact (All calibers)