Quoted: You are dreaming too hard.
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Perhapse, but you've missunderstood some things first-
First, your barrel insert idea is overly complicated. Shotgun barrels are so easily removeable that you might as well make a whole new barrel to drop in, rather than a chamber insert.
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Um, I'm working on a SAIGA here, not a standard tube mag pump. If you're not familiar with the breed check out www.saiga-12.com. The barrel is quite fixed.
What I don't understand is how you would get any accuracy at all by shooting a 9mm bullet out of a chamber insert into a 12 gauge barrel, which is of such a larger diameter that it wouldn't direct the bullet's path at all....(snip)
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While I described that as a pre-existing device, if you go back and read my question again, you'll see that I'm not just talking about a chamber, but an entire full leignth rifled barrel insert that will act as a sleeve in the shotgun, full leignth. To put it this way- a full sized 9mm barrel that will slip into a shotgun barrel.
Second, how exactly would you modify a 5 round 12 gauge magazine to reliably feed 9mm ammo?
What would have to be done with the follower and feed lips?
Once again if you read my initial post all the way through, you'll see that I mentioned a magazine well adaptor, or a modified existing magazine. Ever seen a 9mm AR15? There are two ways to tackle using a 9mm magazine in a well for a .223- one is to block off part of the chamber with a slip in piece that locks in like a .223 magazine, and has its own catch for the smaller-size 9mm magazine, allowing the use of a STEN or similar mag. The other method is to take a STEN mag and perminantly modify it with a block in the rear and a modified catch in front to fit in the AR magazine well. There is no reason why these two methods wouldnt work in any other clipfed weapon. One could cut a Saiga 5rnd magazine off right under the reenforcement ribbing on top, and use that shell as a mounting point for a 9mm magazine, either perminantly or as a magwell adaptor with its own catch. The maglips on the original magazine would then become superflous and could be altered or removed to allow the 9mm magazine to sit properly in the action.
You'd need a completely different bolt face for each caliber, plus a different extractor design, and possibly different firing pin protrusion amounts.
One could modify a replacement 12-ga bolthead for this purpose, about $10 through EAA. Thats the cool thing about the Saiga, the bolthead is a seperate piece. It'd probably just be as easy and cheap to replace the whole bolt to make the switch-out easier and faster. The nice thing about the AK design is the bolt is a minor part cost and size wise, so having a different bolt is vastly cheaper than having one on a conventional shotgun. As for the firing pin, this is something I didnt consider, but I dont see why it would be a big issue. If you could mill the bolthead down so the rim sat back a little further into the bolt face, then the firing pin would sit out further anyhow. (Shotgun primers are notoriously soft and require a weaker tap)
Perhaps not impossible, but if you actually got it to work you'd be the Rube Goldberg of our century.
Once again, I'm not sure your right here if you go back and see what I'm talking about in the first place. I dont see the kit any more difficult to produce or employ then a Ciner .22lr kit avaliable for DOZENS of common small arms.
Finally, a blow back system is a blow back system and a gas system is a gas system. When an AR15 jams up because of a gas system problem, you fix the gas system, it won't magically work again just because you told the same gun that it should work on a blowback principle. They are not the same system; put another way, if a .223 doesn't have enough chamber pressure to blow back an AR15's bolt carrier without a gas system, how will a 9mm have enough chamber pressure to blow back a 12 gauge Saiga's bolt carrier (which weighs alot more)?
Ok, here's the thing though, the force excerted on cartridge in my Cobray 9mm is HEAVIER than the force the Saiga bolt puts on a cartridge in the Saiga barrel. Even with my gas system shut off, my shotgun cycles at least some. Then wouldnt it be possible just to swap out the easily replacable return spring in the action, and allow the thing to cycle the whole way with the same impulse.
And finaly, does the 9mm realy exert less PSI on the chamber of the weapon than a 12-ga 3&1/4" shell? I was always under the impression that shotgun shells were VERY low pressure...