I cant pull back the slide all the way. The thing is completely built… trigger pin, charging handle, etc. However, I cant pull the slide all the way back… The slide fits onto both front/rear rails. I just cant pull the slide beyond that. I can take the slide down using the takedown button. So… what am I missing here ?

Ive built numerous glock frames… so not a newbie…

Thoughts ?

  • unseenkiller@forum.guncadindex.comEnglish
    2·
    1 month ago

    I had that same issue. I was working off the strength of a room full of beta testers saying they didn’t have any issue with the Glock 19 internal geometry so I left it.

    Now that I’m working through my pistol versions of the 19 I’m seeing the same issues. Whatever typo’s may or may not exist in the BOM / ReadMe (sorry!), I think if you’re not new to Glock, it’s not you - it’s the design needing a revision to be more inclusive to other parts.

    FWIW, I had the same issue with the 17, and just finished fixing it in the CAD. The 19 is next on my chopping block, and I’m about to throw all of his CAD out and replace it with my tested Block 19 CAD and then start micro-adjusting all the imperfections until I love it.

    So, in summary, my apologies if it’s not working for you - there must be some magic “stars aligned” situation going on with the 19 / Franken-9 CAD.

    Notes:

    • try taking out your front or rear rail pin (or maybe both), could be the holes needing to be drilled out
    • try removing your takedown spring, you can’t shoot it this way, but you can elevate the takedown with your fingers during install and confirm whether or not there was an issue with takedown pressure (this never happened to me before the Franken-9 assembly)
    • make sure it slides smoothly back and forth without a barrel installed, bad rails, bad friction, bad support junk left in the cavity can angle the rails and make everything bind up like wild (you probably already knew this)

    My “Hammer Fired Glock” handgun series (including 17 and 19) are just around the corner though, so if you’re not having luck, you’re not at a loss for long.

    • Kopsis@forum.guncadindex.comEnglish
      3·
      1 month ago

      I just built up my Franken9 frame and have a very similar problem. The root cause is the recoil spring stop in front of the slide lock. The back of the recoil spring guide rod is supposed to butt up against this:

      In the Franken9, this is V-notched for some reason.

      That lets the guide rod pass through the stop and butt up against the slide lock. Depending on your parts, the barrel may then bind on the guide rod when it’s trying to drop into the locking block. Even if it doesn’t, this isn’t the way you want to run the gun since the slide lock isn’t designed to do double duty as a guide rod stop.

      It’s possible to get the current frame working correctly by cutting an appropriately sized steel washer in half and epoxying one half to the front of the guide rod stop.

      • pv2025@forum.guncadindex.comOPEnglish
        2·
        1 month ago

        “appropriately sized steel washer in half and epoxying one half to the front of the guide rod stop.”

        ill just wait for the corrected design and/or an official USK release. thanks for your support here … glad i wasnt the only one who experienced the same.

      • i_comma_caligula@forum.guncadindex.comEnglish
        1·
        1 month ago

        Mine worked the first time until I disassembled it and reassembled it. I figured out the same thing you did, but I messed with it a bunch (including not installing the recoil spring assembly just in case it was the barrel lug and locking block–now obviously not it)

        I can see how the beta testers could have missed it because it got stuck 4 out of 5 times at first (my first successful try was a fluke), then I was able to figure out a technique to get it seated correctly every time. But even if seated correctly, if you just nudge the guide rod a teensy bit you’d hear it slip and it would get stuck, lol

        It’s good it’s fixed now but the struggle to figure out what was going on was actually pretty useful to me, I’m now way more familiar with the internal workings than I was at the start (not the first time this kind of thing happened in 3D2A, of course)

    • Kopsis@forum.guncadindex.comEnglish
      3·
      1 month ago

      BTW, thanks for all the work you’ve put into this! I really like this style for a PDW and your improvements are really clever. I’ve wanted to do a Recession Ruger for some time, but I prefer to shoot suppressed and threaded Ruger barrels are completely impractical. Being able to do a similar build with Glock parts is awesome since it opens a boatload of aftermarket options.

      • pv2025@forum.guncadindex.comOPEnglish
        2·
        1 month ago

        yeah… i use my R3 almost every range trip… and thats 4-5x per week. i have a r45 built, but for some reason i cant get it to feed… so it just sits… using g21 mags. its as if the mag sits too low or maybe the slide sits too high…

    • pv2025@forum.guncadindex.comOPEnglish
      2·
      1 month ago

      yeah i figured there was a design/cad issue… especially when i tried a slide that hadnt been modified. ive since just put the 9/10 completed build in its build bin… will wait until an official release is published by you. espeically the g17 varient… as i have too many g17 slides and a g17/22lr conversion slide i want to put to use.

      • unseenkiller@forum.guncadindex.comEnglish
        1·
        1 month ago

        The 17 is done and ready. I’m tackling the 19 today. If you’re super eager, toss me a DM on element and I’ll slide you the 17 as a pre-release.