XP COMP & Ported Pistol – Ambi Thumb-rest Edition. Integrated ambi thumb-rest gas pedals for enhanced recoil management, compatible with Glock magazines 17 rounds or higher, threadless compensated barrel, four top slide ports, steel frame, aluminum grip, and removable magwell, Tenifer QPQ coated, Novak sights, and RMR/SRO optic footprint.