This is a Lone Wolf Distributors Trigger Shoe known as the Ultimate Adjustable Trigger, model LWD-UAT-A-BLK.
Choose the bare trigger shoe (LWD-UAT-A) if you want to put the Lone Wolf shoe onto the Glock bar you have. The oversized safety lever allows more comfort to the shooter's finger.
Features:
6061 Billet Aluminum
Oversized Safety Lever
2 Piece Design
Single Screw Assembly