C-More M26 Underbarrel Shotguns and AOW | Shot 2017

I think it’s fair to call this a “Shot Show Secret” isn’t it?

C-More is primarily known for their optics lines, but they also produce a special line of short barreled shotguns for the US Army. These shotguns are now fully available to civilian owners in the USA, along with a line of sporter shotguns built on the same side-charging system.

The system works with either 5 round or 3 round magazines, and is a manual operation with a side charging handle attached to the bolt carrier. They use a spring-loaded stand-off muzzle device, that ensures the M4 barrel does not impact obstacles when breaching, but collapses down to match the M4 barrel when not deployed.

On the under-barrel version, the rear iron sight protection fits into the barrel nut of the M4, and the front iron sight pins into the rifle. An additional block on the top of the shotgun receiver can be raised and lowered in clicks, allowing the user to zero the shotgun to the M4 sights.

Additionally at Shot Show, C-More had an “Any Other Weapon” version of the M26 with an ultrashort barrel. Instead of a $200 NFA short barrel shotgun tax-stamp, the AOW tax stamp costs $5.

They’re not new. In fact they were designed in 2002 as a replacement for the Masterkey system. But this is the first time I’d ever stumbled across them, or been made aware that anyone willing to pay up to the ATF can take them home.

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Edward O

Edward is a Canadian gun owner and target shooter with a Bachelor’s Degree in Journalism. Crawling over mountains with tactical gear is his idea of fun. He blogs at TV-Presspass and tweets @TV_PressPass.


  • Anonymoose

    I thought something was missing when I saw Miles’s post today after watching your video last night…
    Anyway, I would probably go for the 12″ version and not the ridiculous no-barrel version.

  • tony

    next time if I forget my key…

  • Steve

    Those shotguns been at SHOT many times in the past. Did you happen to check the MSRP? If I recall correctly, it was some ungodly amount due to the contract pricing.

    • Steve Truffer

      1250 for AOW version, 1500 for SBS, per Ira on screen.

  • NCjumper

    That was pretty cool watching the industry rep talk about how they came to be, the history, and the operation. He really knew his stuff.

    • schizuki

      Agreed. Straight facts, no PR puffery and bullshit.

    • He ought to know his stuff. Ira Kay is the founder of the company, and the designer of the LSS/M26 MASS.

  • Christian Hedegaard-Schou

    They could add the longer barrel to the AOW version and as soon as they hit 26″ OAL, it becomes a regular consumer-legal Title 1 “Other Firearm”. No tax stamp either and most states won’t need the barrel length to be 18″.

  • IshTheBuddha

    Bolt pistol from Warhammer 40k

    • AD

      Naah, it’s far too small…

  • Joseph Smith

    WANT! Just waiting for that NFA repeal…

  • Reef Blastbody

    Make one with a 16″ barrel, hydraulic buffer and a more standardized pump mechanism and I’d buy one in a heartbeat.

    • Tom Currie

      That would be the silliest SBS ever produced! Why would anyone put a SIXTEEN inch barrel on a shotgun and have to pay a $200 NFA tax stamp for it when two more inches would make it legal as a regular shotgun

      • Reef Blastbody

        Brain fart. 18″ barrel, yes.

  • The original C-More LSS (Lightweight Shotgun System) goes back even further, and there was even a brief period of time when Colt cooperated in its development. It was in this era when C-More ran the Colt Competition shop, and Colt was using some of Ira Kay’s patented part designs in their Defender and XS-series of pistols.

  • Tassiebush

    It was interesting to see the correct technique for use demonstrated.
    It would be interesting to know what the teeny one’s velocity would be like. Obviously it’d be pretty low but would it be useless or just entirely different from the norm but functional in it’s own way. it is interesting that he mentioned it was easy to shoot one handed.

  • derfelcadarn

    Where does one adjust the phaser settings ? This is whole lot of BS.

  • David Michael Homer

    I fired this at MP School, 2013. I recall sharp recoil, loud report and a fireball. I also remember the mag dismantling after a 3-foot fall. Behold the C-More M26: the single worst shotgun I have handled thus far.

  • Benji

    Master key setups are hilariously legal in Canada.
    Barrel length isn’t really an issue here (we’ve got a 8.5″ barreled Chinese 870 clones) but 26″ OAL is needed to be non-restricted. By attaching a small shotgun to a rifle, the rifle effectively becomes the shotgun’s “Stock”.
    With a few snazzy adapters you can build an Norinco M14 with an underbarrel, mag fed 870 clone for about $1000 and its completely legal and unregistered.