GLOCK Thumb Rest Trigger Pin - Align TacticalSecure Design The Thumb Rest Trigger Pin utilizes a patented forked design that leverages the disassembly channel's (opening) as an insertion point for accepting an anti rotation stop. Pushing the trigger pin partially out (of an UNLOADED PISTOL), allows the anti rotation stop to clear the disassembly channel so the slide lock can be pulled down for normal disassembly. Compatibility We've enhanced the product line with two key features to determine