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How to Build a Glock Pistol with a Polymer 80

If you’re looking to grow your ghost gun collection, building a Glock from a Polymer80 is an excellent option. Glocks are excellent weapons for a variety of different uses, and the internals are notoriously reliable. Putting these internals into an 80% frame makes for an extremely useful and helpful weapon.

Adding an 80% Glock to your arsenal is a great idea. Similar to building an AR-15 from an 80 lower, building a Glock from a Polymer80 lower is relatively simple. In this article, we will talk about what tools you will need, and give a quick overview of how to actually finish the weapon.

Tools You Will Need

  • Drill press
  • Hand drill
  • Vise grip
  • Cross vise
  • Calipers
  • Level
  • Hammer/punch set
  • Files/sandpaper or Dremel with sanding wheel

Ok, so you’ve got your Polymer80 lower and the frame to drill it out


Glock 17/34 

80% Standard Pistol Frame and Jig Kit Glock 17/34

Polymer 80% Pistol Frame and Jig Kit Glock 26/27


80% Compact Pistol Frame and Jig Kit Glock 19/23


Luckily for you, they come with all of the milling bits that you will need, so check that off your list!

From there, you’ll put the frame and lower into your vice and drill the side pin holes with a hand drill. You drill one side at a time, making sure that you don’t go all the way through the lower.

Next, use the large end mill bit to get rid of the top rails. These are the parts of the lower that stick out above the jig. You can do this with your drill press. The bit should be more or less even with the jig.

You’ll also use the drill press and large end mill bit to mill off the barrel block. In order to do this, you want your jig to be more or less standing upright. The bit should be pointing down through the nose of the jig. Inside the lower, there’s an indented area with a “U” shape in it near the front of the trigger guard. Don’t remove the outsides of the “U.” The outsides are the slide buffer. You only have to remove the barrel block. There’s a designated indentation inside the lower, and all that you’re doing is removing a slot to allow the guide rod to move.

From there, put on the Locking Block Rail System using the pins. It should line up with the front of the trigger guard, and you may have to slightly tap it into place. The pin will go through the hole above the trigger guard.

Next, you’ll install the Frame Parts Kit and the Rear Rail Module. The frame parts kit consists of the trigger mechanism. You’ll have to buy this separate from the lower. The remaining instructions for this step will go over installing parts of the frame parts kit.

  • Install the magazine catch spring. You may have to use a hammer to tap it into place. Keep in mind it will stick out a little.
  • Install the magazine catch. It’ll snap into place when it’s in the right spot.
  • Slide locking lever spring and stop are up next.
  • Install the trigger. To accomplish this, you’ll use the included Rear Rail Module. Put the module around the trigger and line the whole thing up with the rear housing hole and trigger hole. Install the trigger housing pin.
  • Install the locking block pin.
  • Install the slide release lever. It’ll slide into place next to the trigger, and should be aligned with the trigger pin hole.
  • Install the trigger pin to hold the trigger and slide release in place.

Once you’ve done these steps, your lower receiver is complete. From here, all you will need are a slide, slide parts (most slides come with these), and a barrel. Just like that, your weapon is complete.

Make sure to do functions checks with an unloaded weapon before attempting to fire!



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