The Glocks in .40 need this pin, they had issues with 2 pin .40 Glocks. Glock makes all the frames in one run. So all Frame 1 (or 9mm,.40, and .357) Glocks are made with 3 pins. saves on production cost. Think of it as an over built part, and allows you to but a .40 Slide conversion for your 3 pin 9mm Glock. CheersAlfred said:What is the difference between the 2 pin and the newer 3 pin Glock-19s ?
What does the 3erd pin do ?
Are the older 2 pin Glocks any less durable then the newer 3 pin Glock-19s ?
Thanks