This is a CMC Triggers Kit known as the Drop-In Trigger Kit, model 71501.
CMC Triggers Corp. announces a revolutionary new trigger design for the Glock Pistol. Utilizing their Patented "Signature Flat" trigger design" CMC has downsized the overall geometry to create an excellent fit in the Glock pistol.
Features:
Flat Trigger Design
Drop-In
Smooth, Crisp Trigger Pull