F.A.B. Defense PTK, Ergonomic Pointing Foregrip and Grip Position Support/Handstop, Fits Picatinny Rails, Black FX-PTKCB The PTK- Ergonomic Pointing Grip conceptualizes within its design a unique combat proven instinctive shooting method incorporating natural pointing positioning for enhanced accuracy" speed and overall performance. This combo kit combines the PTK with the VTS Versatile Tactical Support handstop. Compatible with Picatinny rail interfaces.