Pete sent us his very nifty suppressed PDW carbine chambered in .40 S&W. It looks like a lot of range fun in a very compact package. He built it using:

* QuarterCircle10 Glock Small Frame (GSF) lower
* ATF Form 1: ATF EFile
* SilencerCo Octane 45HD with fixed barrel adapter
* Macon Armory .40S&W barrel – 3.75″
* Macon Armory .40S&W ramped bolt
* Heavy Buffers 45ACP buffer and Wolf XP buffer spring
* 22 round .40S&W Glock mags
* MEGA “Slick Side” billet upper
* MEGA Charging handle
* Samson HK Front Sight and A2 Rear Sight
* LWRC Compact Stock
* Seekins 10″ BAR forend.
* Geissele Super Semi-Automatic (SSA) Two Stage Trigger
* DSG AR15/M15 Enhanced Bolt Catch
* Noveske STS Short Throw Safety – Ambi
* MAGPUL MOE RVG (Rail Vertical Grip) – cut down
* MAGPUL MOE-K Pistol Grip for AR15/M4
* Taran Tactical Glock 9/40 Base Pad
* NFA Engraving: c/o MAC Tactical
* Magpul OD Green Cerakote: SMI Powdercoat

Quarter Circle 10 GSF 2

Thanks Pete. And a special thanks for linking links to all the parts!



  • BattleshipGrey

    That. Is. Sweet! I would LOVE to do something like this, but currently my state doesn’t allow (man I hate using that word) NFA stuff. We’ll be lucky if we get suppressors passed this year.

  • Michael Acuna

    That little baby stubby grip is so cute (^o^)

    • Ian Jordan

      I’m glad I’m not the only one that saw it and had the same reaction my gf has when she see’s a kitty or puppy. OMG IT’S SO CUTE I JUST WANT TO HOLD IT AND LOVE IT!

      • Phil Hsueh

        And hug it, and squeeze it, and call it George!

  • Taylor TX

    That looks like one hell of a good time.

  • BearSlayer338

    Pretty cool but,I would have went with .45 acp in a suppressed carbine.

  • Dracon1201

    Very cool. Why didn’t you go with a .45 for a dedicated suppressor build? It’s easier to find subsonic, and harder hitting.

    • iksnilol

      Maybe he has a pistol in 40 s&w?

      Also, I don’t know how it is in the US but in Norway the .45 ACP is notoriously inaccurate.

      • mosinman


        • iksnilol

          It’s a joke. The point is that .45 ACP is expensive, so after every shot people throw their head to the side to look where the case landed. Surprised there hasn’t been any .45 ACP related whiplash.

          At least that’s what I have seen here where I am.

      • BearSlayer338

        Are you buying the cheap stuff?

      • Dracon1201

        In the US we have access to so many brands of ammo that I’m sure you could find something to work in the gun well.

        • iksnilol

          Mechanically there’s nothing wrong with .45 ACP. It is just a joke poking fun at the price of it.

          If you read my comment above it you will understand better.

          • Dracon1201

            Ah, I see.

    • hod0r

      180 gr is the most common .40, is cheaper, quieter and has higher energy than 230 gr .45.

      • floppyscience

        It doesn’t have more energy if you’re talking about a dedicated subsonic rifle.

      • Dracon1201

        Not subsonic .40. Subsonic .40 has considerably less energy.

        • hod0r

          False. The speed of sound at standard conditions is 1115 fps. 230 gr .45 ACP standard velocity from a 5″ barrel is around 850 fps. This rifle has a 3.75″ barrel, so velocity would be somewhat lower. To match the kinetic energy of 230 grains at 850 fps in a .40 S&W it takes 960 fps. Regular 180 gr .40 FMJ is typically around 1000 fps from 4″ barrels, thus it has higher energy, is still well below the speed of sound and is quieter.

  • richard

    I’m building something exactly like this! So I can shoot steel up close and shoot without bothering the neighbors (Except its in 9mm and I ran out of funds)

  • Anonymoose

    Sweet. Never heard of this company before, but their Large Frame lower is something I’ve been looking for for a long time.

  • WV Cycling

    Isn’t .40 S&W a bit pricy to be bang whizzing with in a carbine with stick mags?

    • AJ187

      Not if your reloading, sir. For me the difference of loading 9, 40, 45 is the amount of grains of lead.

  • AJ187

    These are fun lowers but expensive. My 9mm lower from DDLES runs great. Quarter Circle Ten is a legit group of people that won’t screw you out of your hard earned money.