This Extended Control allows you to manipulate the Slide Stop (also known as the slide release) without altering your grip. The extended shape of the part makes it much easier to access the slide stop to allow the slide to go forward when locked back. 

Even more importantly, the Extended Slide Stop makes it easier to lock the slide back when showing clear and safe. 

Fits all Glock calibers, Gen 1 - 4.

Does NOT fit the G17/G17L/G34 made before 2002 nor does it fit the slimline models G42/G43/43X/48.