Glock Trigger Housing Adjustable Trigger Drill Jig by ian99rt

Last crawled date: 3 years ago

NOTE: These drill jigs are one time use as the holes will open up after drilling and cause you to get too close to the outer surfaces. Also I used variable layer height to tighten around the holes at 0.07mm layer height printing in PLA (PETG doesn't like to print lower than .15mm layer height on my Prusa Mk2s).
UPDATE: R03 has larger hole moved .015" inwards. R02 (.020" offset from R01) worked well but threads almost broke thru on the inside surface. I've used this design on 3 housings and its worked wonderfully.
R01 drill jig was causing the larger drill to be too close to the outer wall of the housing. Not sure exactly why because measurements all lined up but were .020" off when drilled.
Hated the stock trigger on my Gen 3 G34. Zev Spring kit, 25 cent polish job, Zev Pro connector all made it better but the pre-travel and over-travel just stunk.
This drill fixture is meant for a #56 (.0465", front end of housing for pre-travel) and #40 (.0980", rear end of housing for over-travel) drill bits for the forward and rear drilling points.
The front end hole is tapped for a M1.6 thread and the rear hole an M3 thread. I used Stainless Flat Face set screws purchased from Mcmaster-Carr.
The trigger housing needs to have the metal ejector component removed. Drilling and tapping the M1.6 thread without the ejector has a benefit of allowing you to adjust the pre-travel then reinsert the ejector which cause an interfence in the thread locking the super tiny set screw in place (you cannot adjust it with the ejector installed in the housing).
Also to really be able to remove the pre-travel you will need to either shave down or cut off the large "foot" on the back side of the trigger safety. I use a pair of flush cut electronics cutters to simply snip the foot off. This allows you to remove alot of pre-travel and the new ledge created keep the trigger safety functional.
Be sure your printers dimensional accuracy before drilling. Clip is used to simply hold jig in place for drilling.
Also be sure that you do not disable any of the Glocks 3 safety mechanisms. There are multiple youtube videos on the subject and you can print out my Glock Armorer's plate for verifying the drop safety mechanism.
See pictures for final product and trigger safety modification.