Don't let the poor instructions and disassembly fool you - Lone Wolf Arms Ultimate Adjustable Glock Trigger, Trigger Shoe Only

One review sited having to disassemble the shoe for installation as a negative. Actually while the instructions are spotty at best beging able to disassemble the shoe is an advantage as you don't have to guess where the pin inserts into the trigger bar. The tricky part is understanding how to insert the spring and get it to lock in, but it isn't that difficulty. It just takes a bit of dexterity.

Adjusting over-travel is a matter of taking as much of the overtravel out as you can while maintaining a CLEAN break. Pre-travel can be more sensitive because you don't want to take so much out as to have the trigger bar begin to engage the safety plunger in the slide. Just leave enough pre-travel in the shoe so that it has SOME travel before hitting the wall and the break. With both pre and overtravel adjustments you can shorten the stroke quite a bit, so use common sense to make sure you don't put your weapon in a situation where it might fire before you intend it to.

One of the pros of the shoe itself is the contour. It is probably what the Glock OEM shoe should have been.