TL;DR; Just a random idea I had, but would a giant rotating shotgun-type weapon be effective?
I had this crazy/stupid/possibly-been-done-before/very-dangerous/probably-all-of-the-above idea. I have one quick sketch of the weapon but if you can't see it will or something I'm gonna try to describe this as best I can.
Take a circle, make it about 2-3 inches thick, and a foot wide. Mount this on some sort of rotating dealio that will spin easily.
Take a giant shotgun(or any other weapon, I just think a shotgun would be really cool and it has the flippy barrel thingy that you kinda need for it to work) and put on on the top and bottom of the circle. The top shotgun should be pointing forward, or if you want to be a rebel make the bottom one pointing forward. If you rotate the circle 180*, it should look exactly the same as it did before the rotation.
Now take some sort of slide thingy with the ammo for you chosen weaponry(probably shotgun) and give it a disintegrating ammo chain. The slide holding the ammo should be able to move freely but return to its position quickly.
One link of the ammo will hang over the edge of the slide. This hanging link should be X inches away from center of the circle, where X is the distance from the center of the circle to the breach of the shotgun.
Add a small peg Y distance above the center of the circle, where Y is the distance from the center of the circle to the end of the shotgun minus about 3 inches or so.
(optional step) Take this entire setup and mount it on a slightly movable platform so you can aim it within a degree.
Load both shotguns.
Fire the top shotgun(or bottom if you're a rebel), which should be pointing forward. (major hand-waving ahead)The kickback should rotate the circle, and the small peg above the circle around the end of the shotgun will open the breach. The now-open shotgun will eject the spent cartridges somehow, and then slam down on the first link of the disintegrating chain hanging off the edge and load itself.
When the second shotgun fires, the kickback will separate the first ammo link from the rest and the first shotgun will rotate around and snap up, closing the breach and be ready for firing. The ammo chain slides forward on link and resets to its position as the barrel of the first shotgun will move it around some. The second shotgun does what the first shotgun did, reloading and ejecting cartridges and such.
I was kinda imagining that this would be on the side of tanks or walking mechs or really deformed helicopters, and maybe a sort of support artillery unit. The concept could be used for quickly reloading mortars, RPGs, AA flak, or pretty much anything with a little bit of tweaking.
Take a 102/35 on SPA9000 and replace the gun part with this shotgun thing, add a shield in front, have the gunner stand to the side of it, and bam, light shotgun truck thing. Of course you would use whatever military vehicle is around at the time, this just already looked mostly like this idea.
Grab a tank, slap this on either side with whatever ammo or variation you want, and all done. Just point and blam, no more people in that direction.
Take the first variation, angle the shotgun thingy upwards(but keep the ammo rack and pegs in the same spot), fill with AA flak ammo, and use as AA flak cannon.
Slap on either side of a helicopter, angle slightly downwards for anti-ground, or keep level for air-air dogfights
Could possibly be a gun on a bomber, take first variation and stick it in a big plane.
Quite a bit of others, but I'm not sure how to do fighter planes tho. Suggestions would be welcome.
I feel like this leaves the weapon rather exposed as it has to be mounted on the side and has to rotate freely, which can be easily jammed by body parts, random debris, etc. You could probably put an armor plate on the out side, but you have to leave a channel for the weapon to rotate freely.
Also, this seems fun and all, but there's already machine guns which fire pretty quickly already, so this thing might not be needed at all. Even if you rig it to shoot giant anti-tank projectiles, you would run out of ammo rather quickly, and if your good you only need 1-2 shots, not a rapid fire 20 shots.
And it really sounds like I'm just reinventing the Gatling gun, just in a very roundabout and possibly cooler looking and/or less effective way.
Would a design such as this be a viable design for any type of weapon(handheld, emplacement, or mounted vehicle)?
If this has been done before, please let me know and maybe link to it. I don't really care about the time frame it would be useful at, it could be anywhere from near-future to whenever disintegrating ammo chains and guns came around, just wondering if it's a decent design that could be effective.