Refined Idea: Entry/CQB Shotgun

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Nightcrawler

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I've been thinking about an idea for a shotgun designed especially for entry and close quarters battle situations. For these types of scenarios, a shorter weapon is handier, and can makes it that much easier to manuver in tight quarters.

However, with current shotguns, you make a sacrifice when you shorten the barrel; you also shorten the magazine tube. Whereas your entry carbine or SMG might hold 20-30 rounds, your shotgun has 4 or 5. Granted, one 12-gauge buckshot load will do the work of several 9x19 rounds, but in battle you can never have too much ammunition.

Another thing I took into consideration was the wide variety of loads used in shotguns, and the fact that they won't all cycle properly in a semiauto. Also, the racking of a shotgun slide ends more hostile situation than many realize, according to many police officers. It's an attention getter, to say the least.

Please note that the MAJOR drawback to this design is that it CAN NOT use conventional ammunition. It's a magazine fed design that utilizes a double column magazine, requiring a special rimless cartridge, which would effectively kill almost any practicality in the real world (not to mention that with its roughly 14" barrel it'd be illegal for most of us).

The design I have in mine looks similar to a very short .308 rifle. It's a gas-operated semiautomatic design, that can also be fired pump action. The pump is the "charging handle", allowing for the very attention-getting "KERCHACK" sound that the cops like so much, and would also allow rapid clearing of a misfire or a failure to cycle.

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It would be magazine fed, feeding from a 12-round double column magazine. This mag would be about the same length as a 25-round Galil .308 magazine, though wider. Not as good for prone firing, but you don't go prone much in most close quarters or entry situations. Longer, larger capacity magazines could be used if necessary.

Possible inclusions would be a magazine cutoff, allowing the shooter to insert a different kind of ammunition directly into the chamber, such as a beanbag or slug round.

Pump firing would be available for such things as beanbag rounds, rubber buckshot, and other loads that won't cycle the semiauto (a gas shutoff would probably be a good idea too, if a lot of these rounds were going to be used in one session).

It would feature adjustable ghost ring sights and either a folding or fixed stock.

Ideally, it'd have an overall length of roughly 34" or so, yet would offer the shooter 12 or more rounds on tap.

Again, the magazine and feed mechanisms of this weapons would require special rimless shotgun ammuniton (12 gauge is a good size, but something slightly smaller would allow for less bulky magazines, such as a 14, 16, or even 20 gauge). The concept is purely theoretical.

So, what's the word? It WILL come up, so I'm going to answer it right away; the only real advantage this weapon, if built, would offer over a stock pump shotgun would be capacity in a compact package. You simply don't get 12 or more rounds out of a pump, save the Neostead. And on the Neostead, you have to raise the magazine tubes to load them, hindering the typical "shoot one, load one" mantra of tube-fed weapons.

Is capacity important? *shrug* Can't hurt.

Now, to answer questions ahead of time.

-Yes I know what we have now works well.

-Yes, I know shotguns are of very limited use in the military. I didn't specify military.

-Yes I know the attached drawing is crude and possibly ill-proportioned; it's Microsoft Paint, and the best I can do.
 
The problem with magazine fed shotguns is lack of capacity. Sure, you can make a 20 round 12-gauge, but the magazine will at least a foot long. The one in the picture would probably hold 5-6 rounds. Maybe a double-stack.

At least a magazine fed shotgun could be reloaded quickly.
 
You might try a drum fed magazine. I remember seeing one online somewhere and I think those fit 20rnds or something like that. Would reflex sights be an option on this shotgun?

Nightcrawler, the pic of your marine magnum is inspiring me to get one myself :) Same setup but I want to see how a reflex sight would look on that guy :D
 
I like it.


I'd dump the pump portion, and go with an RIS on the front so you can mount lights and things, and make the controls as similar as possible to the ar-15/m16 series of weapons.


the biggest problem IMHO, with shotguns as entry tools is having to retrain operators in their use.
 
I liked it when it was called the Franchi SPAS-15. http://world.guns.ru/shotgun/sh06-e.htm

Why do double column magazines neccessitate a rimless shell? The .303 Brens worked fine with them. Requires a good design that prevents rim snarl though, which usually means a degree of curvature to the box mag.

Better have strong hulls on those shotgun cartridges too, as a spring strong enough to reliably push up 12+ 1.5 oz shotgun shells will very likely crush the top shells. The USAS-12 has 10rnd mags, although they are quite big and of dubious reliability. The H&K CAWS used belted all brass 12ga shells to solve this problem.
 
Andrew wyatt: elder gods probably use slightly different loads :D

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My pick would be a Stryker (sp?) style if I need uber short and mag capacity.
 
Since you are going with pie in the sky wishes for this shotgun, be sure that it is the lightest weight, has the least recoil, isn't too loud, is inexpensive, can be used well with no training, etc.
 
I kinda like the look you have going there. For that short of a barrel I would want to see some form of stand-off to prevent barrel obstructions and for taking down doors.
I would suggest a slightly staggered 10 round mag with an interrupter like on a Mosin-Nagant for rimmed rounds.
10 rounds is small enough to carry spares without needing suspenders and a staggered mag would be about half again as long as a 5 round box of 12 gauge ammo.
I would say pass on the ghost ring sights, more than you need a close range. Go with some sturdy block-style conventional sights. Heck, if this is just for CQB/Entry make the front sight big enough to hold 2 LEDs and a couple of watch batteries, it would not take much room or weight.
Go with a mid-length fixed stock with some form of recoil reduction system built in.

Personally I would want a semi-auto only version in 20 gauge with a rifled barrel for slugs and a 15 round mag, or a full-auto version of the same.:evil:
 
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