i define my reality through misery
Probably the best shotgun you could get, if you could choose any, would be the USAS-12. United States Automatic Shotgun, 12 Gauge. Gasoline powered, 20 round drums, and of course semi-automatic. Works with specialty rounds, like flamethrower or explosive shells too.
I hate these damn stupid rifles with stocks. If you're a big enough sissy you can put a sandbag between the end and your shoulder... like I do. =)
You don't want a rifle that close anyway... if it has a scope the kickback could drive it right through your eye. That's called a 'relief', the spacing between the end of the scope and your eye so firing it doesn't kill you. At least I think it's called a relief, I really don't know. =P
I like the half and half combination... picture the Doom shotgun in your head. Add a pistol grip and another one on the slide. Now it works both ways, fire it however the fuck you please.
The proper way to saw off a shotgun is a little more complex than most people realize. You do saw off the barrels as short as possible but you can't cut the support short or the gun might break when firing. Filing the ends smooth is important too, you don't want to cut yourself on a jaggie. Seriously, jagged metal is painful as fuck. The next bit is to saw off the stock, preferably right where it breaks from a grip to the shoulder. The end of that will fray, unless you put a few layers of electrical or duct tape around it just to keep it smooth. The next step is to drill a small hole through the bottom of it so you can feed a lanyard through it. They don't make sawed off shotgun holsters, so the best you could do would be put a nylon rope through it and carry it sorta like a purse.
A really old classic trick, when you're taping up the stock you cut, is to tape a spoon into it to absorb most of the firing shock. Just bend it partway until it fits comfortably in your hand. The first shot will bend it to your hand, though. This is the trick a lot of bank robbers did, they only needed one shot just to frighten people anyway.
Didn't you fuckers ever watch Dragnet? The LSD episode is a classic. =)
Makes me wonder why they don't make rifles/shotguns with a stock that has a bunch of springs in it. Probably because you shoot it, it glides towards you, then it springboards off of your chest 20 feet into the forest. Yeah, that's probably why. Hahah.
The best weapon design yet is the bullpup design. It's ugly as hell and it looks weird to grab but damn are they comfortable as fuck to hold. Haven't shot one yet but I hear nothing but praise for them. Look for a picture of the FN-P90... that's a good bullpup submachinegun. They do make semi-auto bullpup shotguns... I bet they're comfortable as hell.
They're kinda like a gun that wraps all the way around your arm, balanced for weight too.
No self respecting marine taking on the armies of Hell would be caught dead without one.