Polymer 80 PF940C

  I have to admit, that after seeing the Polymer 80 PF940c frame in person, I had to get one. Polymer 80 was gracious enough to send one to me for review. The PF940C frame came in 3 colors at the time, so I opted for gray, more colors have been added since then. This is a 80% frame for Glock Gen 3 parts. One must first machine the frame to get it to function.

  When I first received the frame, I noticed that it came with all the tools needed to finish it out. The only thing missing was a drill press or a dremel tool. The kit includes a plastic jig that the pistol sits in. This jig is a one time use type of deal, but works really well. Basically you pull up the online instructions and go from there. Brownells also has a video series on machining the frame. First thing I did was drill the holes. Drill each hole from each side of the jig, don't think that you can just drill through the whole thing. Next, I actually took a mill and machined off the four "nubs". One can use a file, a dremel, or a drill press with a vise for this also. The last machining step is probably the hardest. In this step they have you mill out the recoil spring channel. Just pay close attention and you'll be fine. I had to dremel the channel out some more after I installed the locking block so that the recoil spring moved smoothly. I figured that you can always remove more material, but you can't add material.

  After the machining steps are done, it on to installing parts. The Polymer 80 PF940C frame kit comes with a locking block/front slide rails insert. Just drop this in and install the front pin. Also in the kit is a Rear Rail Module. This rail piece sits around the Gen 3 G19 trigger mechanism housing. I really like how they did this as it gives metal rear slide rails and is easy to install. All the other gen 3 parts go in just like a standard Glock 19. If you don't feel comfortable doing this yourself, please take it to a gunsmith.

As received

After machining and parts installation

  Now that it is assembled, it's time to go into some things I noticed about the PF940C. I love the grip texture that comes on the frame! It is not too rough, but not smooth either. It feels kind of like they glued sand on the frame. I did run into a problem with the takedown spring. The channel in the frame, where the flat tab sits, was not cleaned out, or still had a thin piece of plastic from the molding process. This made the spring sit too high and put upward pressure on the slide. I took a sharp x-acto knife and just moved it back and forth to clear out the slot. This worked good, and the spring flat slid in and sits flush. The other hitch I ran into had to do with the recoil spring channel. As mentioned above, I dremelled out more of the channel, this was so the spring wouldn't rub on the sides of the channel. Result, smooth as butter. 

  The PF940C frame has some improvements over a stock Glock 19. Besides the texture I previously noted, It has a really nice undercut trigger guard so you can really get your hand up high on the pistol. I didn't care for the front of the trigger guard, it's squared off angle looks good, but makes it not fit in some Glock 19 holsters. Holster makers are starting to address this problem, so in the future your options should be better. Polymer 80 also makes a smooth frame for those wishing to add their own texture. For those with larger hands, It also has an extended beavertail. My favorite is probably the different grip angle. This grip angle just works better for me than a stock Glock. You may, or may not like it, it really is personal preference. There is also a STANAG rail up front to mount a light. My frame, when using a Grey Ghost Precision slide and barrel, locked up super tight. It took about 100 rounds before it would cycle consistently. I could have cycled the slide by hand to get the same result, but I was excited to go shoot it.

  These Polymer 80 frames are pretty neat. If you like to build stuff on your own, or just want something different, these might just be the ticket. I had a good time building the PF940C frame into a complete pistol. These kits are really great for building a custom "Glockish" pistol. Go check Polymer 80 out, pistol frames are not the only thing they make.

Firearms Insider Reviews - 8 Key Points

Claim to Fame:

Glock 19 style 80% frame kit

Target Market:

Those wanting to machine a 80% G19 size frame, or those wanting to build a complete G19 size pistol

FNBs (Features & Benefits of this product):

  • Comes with all tools and Jig for machining

  • Online instructions

  • Easy to machine

  • Textured frame

  • Undercut trigger guard

  • Uses Gen 3 Glock 19 parts

  • Metal front and rear slide rails

  • Slight beavertail

  • Built in Metal plate for engraving ser#, etc

  • Picatinny Rail

  • Thumb ledge

  • Available without texture

  • Delivered to your door

What other aesthetic options or finishes are available?

Black, FDE, OD Green, Robin Egg Blue, White, and Cobalt

What others are saying?:

By Hollywood at GlockStore.com 5/5 stars


I was blown away with how easy this was to finish. I used a drill press, but have no doubts this could have been done just a good with simple hand tools. I decided to go with a custom slide, so I did have to rack it about 150-200 times before it would move smoothly. With a Glock factory slide I'm sure it would not have required as much effort. Everything about this lower is exceptional. I field tested it putting about 250-300 rounds down range. I did have three malfunctions within the first 25 rounds but after that, she was flawless. I would have complete trust in this weapon as a daily carry. Do yourself a favor and get one... maybe two of these. They are fun to finish and even better to shoot. Plus they look great.

By Templeton P. at Brownells 5/5 stars


I assume because of these receivers, demand for even just plain old used Glock 19/23 uppers seems to have skyrocketed. It's hard to find one under $300 unless you get really lucky. You will NOT save money vs buying a new Gen 3 Glock (or probably even a Gen 4) by doing it this way. I was seeing used Gen 3 G23s for $299 just a couple of weeks ago. That being said, this is a fun project, and everything can just come to your door. Had never attempted anything similar, but it was relatively easy to complete. I didn't have a mill, but instead bought a milling bit for my Dremel. I had the Dremel Router/Shaper table accessory and it made the job exponentially easier. If you plan to use a Dremel, I would highly recommend spending the extra $35 for this add-on. Freehanded the barrel block. Put the jig in a vice and just took my time and it went okay. Drilling the holes is a no brainer as well. Sanded things down and installed the parts kit without much fighting. Grabbed a box of cheap ammo and worked flawlessly at the range from the first trigger pull. Needs more range time before I trust it completely, but so far so good. Ergonomically, I also find this feels better in my hand than actual Glocks. Going to try a 9mm conversion barrel next.

Link to other reviews:

We Like Shooting review

Price point:

MSRP = $160.00

Retail = $149.99 at Brownells

I need it now! Availability:


Our Rating:


  • Comes with all tooling (Jig, Mill, Drills)

  • Frame texture

  • Uses Gen 3 Glock parts

  • Undercut trigger guard

  • Multiple colors

  • Can be completed with a dremel


  • Some patience needed for small problems

  • Not all standard G19 holsters fit

  • Sharp angled front of trigger guard

Score: 7.00 Good



Chad's Favorite Link:   Poly Gun Mods