Your AAP-01 is one of the most customizable handguns on the market! Get a grip on your pistol with this frame mounted thumb rest. The thumb rest allows a comfortable place to drop your offhand thumb to more easily apply pressure during shooting. This is a common tool used on race-gun style pistols to control recoil and stay on target, even when your trigger press isn't perfect. It can be a great way to set your pistol apart from the crowd and improve the ergonomics on your AAP-01.