Take the time to read the jig markings – the M3 holes are for the pins that hold the blocks in place.If you go straight through then you are way more likely to be way off, ruin the geometry and have just ruined the receiver, So, drill three holes on each side, six holes in total, being careful to line them up as best you can. Because the frame is relatively thin, it is forgiving if you drill a short hole slight off square, meaning not perpendicular. Do not drill the holes straight through.Using a drill with level indicators can greatly aid you in making a hole at right angles to the receiver.You want the jig to be held firmly at its bottom by the vise but do not crush/deform the plastic.It was not designed to be drilled laying on its side. Stand the clamp on its side and secure it in a vise.Note, my Ryobi cordless has a level indicator and it made it a lot easier to get things square. Polymer80 supplies the drill bits for you. The jig is clamped standing up and a hand drill is used to make the holes. Folks, you drill six holes – the jig is marked with the exact spot and which size drill bit they supply that you should use. If you are concerned that this will take a ton of work, Polymer80 has designed a frame (what will ultimately become your pistol’s lower receiver). Drill Six Short Holes As Labeled On The Jig Let’s hit the four categories of things you will need to do.
My aim is to give you a bunch of tips that can help you turn out a quality receiver. In my last post, I linked to a number of resources you can use to guide you through your build. I definitely recommend watching the videos and reading the relevant PDF before you begin.
POLYMER 80 GLOCK 17 HOW TO
If you haven’t done so yet, be sure to check out Polymer80’s own How To page. You just need to be patient, follow instructions and pay attention to details. The great news is that you don’t need to be a machinist to do the work.
The design of the frame and jig are elegantly simple and the quality of the end product is really up to you.
Folks, Polymer80 is making some solid 80% frames that you can easily machine into a lower receiver that accepts Glock parts.
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