This is a "jig" that i designed for use on a gen 5 glock 19 MOS. The front sight intended for being aligned is the TruGlo TFX Pro sight. This model fits onto the stock slide and allows for the front sight to sit in the groove, making it be perfectly straight while you tighten it down.
This might work with other glock models, i am not sure. Please let me know if it fits your gun, and i'll start a list of guns that it's compatible with.