Hybrid-style ledge. Available in RH, LH, or AMBIDEXTROUS. 

Right-handed - Support hand thumb-ledge to press downward into, aiding in recoil control. Recessed index ledge with "slipaway bevel" for shooting finger to slide off of. (less sight disruption than sliding off a hard ledge.)

Left-handed- Same thing, but opposite orientation

Ambidextrous- Hard ledges on both sides of the frame. Designed for people who shoot RH and LH often.

 

NOT AVAILABLE FOR SINGLE STACK FRAMES