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Given the relative price / non-existence of pistol-caliber ammunition these days (up to and including, shockingly enough, .22LR), the rational behind these awesome little toys is somewhat more… lacking, but, still, want:

Converts 12 gauge single or double barrel (break action) shotgun to use 9mm Luger
Rifled for accuracey
Typically shoot’s a 1 inch or less group at 30 ft.
Length of adapter is same length of a typical 12 gauge shell allowing to fit in ammo cases easily
Fits any brake action shotgun that can shoot a 2-3/4 or 3 inch shell.
CNC Machined for precision!
Made in Miles City, Montana USA !!!
Made from Alloy steel!
Three inches long with Rifling
Makes your 12 gauge more versatile for cheap!!!!!

The gentleman behind the ShortLane Chamber Adapters sells them in a variety of lengths (3″, 5″, and 8″), in rifled and smoothbore configurations (the latter being cheaper but less accurate), for basically all the standard shotgun sizes (10, 12, 16, and 20 gauges, along with .410) and even some of the whackier revolver calibers (.500 S&W and .480 Ruger), and capable of chambering pretty much anything from .22LR all the way up to 20 gauge, depending on the overall configuration. They are designed specifically for break-action shotguns – side-by-sides, over/unders, or single-shots – but I suspect, and the reviews seem to indicate, that the 3″ adapters can be used in any pump-action shotgun capable of chambering 3″ shells.

Obviously you are “wasting” at least 10″ of your barrel even with the 8″ insert, but I have to wonder what the shotgun barrel extending past the insert barrel would do in terms of the report… It is certainly no suppressor, but something will change*. And, in any case, you are greatly increasing the flexibility of your shotgun.

Which is what the folks at The Firearm Blog, where I found these little gadgets, were driving towards – making a “survival” shotgun a reality. A lot of folks automatically jump to “shotgun” as their default answer for zombies / bugging out / apocalypse / etc. scenarios, and there is a lot to be said for that particular platform… as well as one glaring problem: ammunition. Shotgun shells are large and heavy, and you yourself are not going to be able to carry too many (in addition to everything else you might be carrying). However, enabling your shotgun to shoot pistol-caliber ammunition while still having buckshot or slugs for more serious applications? That rapidly increases your potential round count while not significantly increasing – or possibly even decreasing, depending on the masses involved – the weight you are carrying.

And while I do not want to take business away from the originator of this shiny idea, I have to wonder if something similar could not be fabricated on a 3D printer… Obviously rifling would be impossible, and the lifespan of a plastic insert would be significantly limited, but if we are talking about “bug out” applications, it may not need to last long. And, of course, testing with a 3D printer and a backyard range makes my little footnote below still quite illegal, but a lot less easily noticed…

Now all I need is a break-action shotgun… I have been eyeing the Stoeger Double Defense series for a while now (Come on now, did you expect anything else from me? I just wish they made a Quadruple Defense, because that would be epic.) but now Mossberg has introduced the HS12, their own variation on that theme (though the latter benefits from not having a safety that automatically engages every time you reload the firearm – why do o/u shotguns have that bit of idiocy built into them?). Hey, at least double-barrel shotguns are something you can actually reliably find these days, though, of course, those two models are sold out almost everywhere…

Yes, I do have a taste for the peculiar. Why do you ask?

(* – On the flip side, I have to wonder how hard it would be to machine an insert like that and add 4-6″ of suppressor-like baffles at the muzzle end of it… Obviously such a thing would be strictly verboten without the appropriate licenses and tax stamps, but for someone with a lathe and a bench-press drill, it would not be that hard to make… or modify an existing insert to have.)

16 comments to multiguns

  • Ironically, I was google-ing chamber adapters when I discovered my first compelling blog.

  • You and I will have to disagree about the Double Defense. I thought it was a stupid, stupid thing.

  • Oh yes, I almost forgot to add:

    “Leeloo Dallas multigun!” :)

  • Remember you are talking to someone who owns a Saiga SBS with an 8″ barrel and who dressed it up to look like Vera. Just because.

    I do stupid :). And I just want one because I like old-style shotties for some reason. I already have an 870 for home-defense; this would just be for kicks… and for the barrel inserts.

    And, thankfully, someone caught the joke. 😉

  • Whats wrong with having the safety come on when you reload?

  • JHat

    Regarding your curiosity, a simple monocore type suppressor would be a trivial addition for anyone able to fabricate the insert in the first place. I imagine an o-ring or gasket would be needed to seal against the inside of the barrel at the device’s muzzle-ward end, but again, that’s easily done. I think this is a primitive design, but not being a suppressor user, I have no idea how they perform in comparison to others, generally or in this incarnation.

    Since I’m the visual type, please accept these borrowed web links:

    Example 1

    Example 2


  • I would like the Double Defense more if it came with dual triggers like an actual coach gun.

    But yes, I am with you on “I do stupid”. For some reason I cannot explain, I still covet that tacti-cool lever-action .22 made by Mossberg that has rails and a 6-point stock.

  • @ dave w: Safeties should be manually-actuated functions/features that operate entirely independently of everything else on the gun; they should not respond to magazines being removed, breeches being opened, or anything else. You should have to manually push it on, and manually push it off.

    Speaking more specifically, if I am reloading a SxS, I am probably going to shoot it again, and I may need to shoot it again quickly. Arguing with a safety rather defeats that intention.

    @ JHat: Yeah, those are basically what I was thinking, only leaving some of the adapter at the aft end to allow the bullet time to stabilize/spin up.

    Really does not seem that hard for a garage shop to manage. Illegal, but not hard.

    @ Erin Palette: Agreed on the double triggers.

    As for the Mossy, that thing is just ugly, and even I have to have standards… 😉

  • dave w

    More likely, you have just reloaded and are waiting for:
    A) your spaniel to bring back whatever you shot.
    B) Yourself to shout ‘pull’
    C) Nature to settle back into its rhythm while you continue walking around the field.
    I have had a O/U for 30 years and its never bothered me, but i don’t do ninja rolls at the range either. If it didn’t come on i would have to put it on anyway.
    My SKS however, i have never used the safety on, as the gun is either 1 second from being fired or just been emptied. :)
    But i DO hate cross bolt safeties, they are clunky and non intuitive and time consuming. Tang safety all the way baby!

  • Oh, I know it’s ugly. There are some ugly things that I find appealing BECAUSE they are ugly. Case in point: the A-10 Warthog. The Mossy is hideous, and yet I find myself enthralled…

  • JHat

    “@ JHat: Yeah, those are basically what I was thinking, only leaving some of the adapter at the aft end to allow the bullet time to stabilize/spin up.

    Really does not seem that hard for a garage shop to manage. Illegal, but not hard.”

    Agreed, totally. If our hypothetical gunsmith were satisfied with 3″ of rifling, he/she/it could put those chambers through the last 5″ of the 8″ version with a drill press or mill… on the other hand, I don’t have the hard steel machining experience to say, but wonder if boring all those big chambers in hardened 4140 steel would be problematic with hobby grade equipment. Threading the end of one of the inserts would be a more skilled operation, but would allow the suppressor to be made of mild steel, lighter aluminum, or maybe even the 3D printed plastic you mentioned in the original post (images of trying to rotate a half-melted suppressor dance before my eyes).

    Actually, if we are talking crude, one of the inserts could be turned down at the end but not threaded, and the monocore could slip on and be held by a set screw.

    It’s a shame that I can’t try these ideas. Oh well.


  • oldradartech

    The sliding automagic safety can be pinned internally. I have a very nice (very) coach gun that was slicked up a bit for CAS, that was one of the things done. Also chambers and internals polished, blah blah blah – slicker than… well, you know the rest.
    There is a video floating around of a speed shooting contest – double barrel vs 870. After the 870’s mag was exhausted the double really showed its’ heels.
    Sorry, Erin, this one is gloss blue, case hardening, inlaid gold, and circassian walnut.

  • @ dave w: And in none of those cases do I see an overwhelming need for the safety to be automatically engaged. Make no question, if you want the safety on after/during those incidents, I see no problems with you manually engaging it yourself, but I see no rational explanation for the hardware itself to do so.

    @ Erin Palette: Now, there is a difference between “functional” and “ugly”; the A-10 is the former (where “function” was defined as “carry a BFG and be able to come home with half the aircraft missing or damaged”), while the Mossy is definitively the latter ;).

    @ JHat: Seriously. Using a shotgun as the external tube for a pistol-caliber suppressor sounds like all kinds of an awesome idea… I wonder if the shotgun itself or the baffles would have to be regulated under current requirements.

    @ oldradartech: Hm. I am not going to ask how much you are wanting for that one, I do not think…

  • oldradartech

    You don’t want it – no bayonet lug… ;}

  • This might surprise you, but the ’97 I picked up from you was the first firearm I have ever purchased that actually had a bayonet lug. Well, apart from MN91s, but those do not really have a lug as such, unless you count the whole barrel.

    That said, “bayonet” my ass. Good lord.

  • Lance H

    @ Erin Palette:
    I see it as more of a versatile bug out gun when paired with the caliber inserts. They advertise it as a defense weapon which I find ill advised. For defense I prefer the capacity of a pump such as the Win 1300 defender with Aguila mini shells that cycle perfectly in this model, are of low recoil, yet pack a devastating punch.