Im sorry, but this is utterly bugging the shit outta me...stryke, there are four serrrious problems with that shotgun you've just built yourself there, first off being that you just converted a pump to an auto, you quite literally need an entirely new gun to be able to do that, with the way the mechanics of the shotgun work, it simply isn't a feasible feat, second is the double barrel automatic, that simply doesn't exist, custom or standard. The forward grip would be nearly six inches wide, and would weight as much as a pair of shotguns strapped together because of the number of internal components, it would make it nearly impossible to aim with any kind of accuracy. Next is the little lighter thing youve set up on the end of the barrel, not only is that horribly dangerous to the user more than the enemy, it's completely useless. That container of lighterfluid would have a serious chance of rupturing because of how hot the barrel of a shotgun gets, and the little flame at the end? Useless. Why? Because it really has no use, bullets coming out of the end of that barrel are going so fast, they'd be more likely to put the flame out then get heated from it. Also, shotguns are not armor piercing weapons, they're close combat with high stopping power. A flame on the end isn't going to do any good considering if you've got a good shotgun already, it pretty much shoots flames out the end anyway...it's pretty cool to watch at night.
Sorry, but nothing about that weapon struck me as being feasible...my suggestion, go with a double barrel if you want power, they're notoriously more powerful than autos because all of the e plosive force is transferred out through the shells, unfortunately it means you'll have to breach load after every two shots. Autos have the advantage of more rounds and less kick, but a certain level less of stopping power because some of the recoil is transferred through the slide to eject and load a new shell.
I would personally go with auto, simply because in a combat situation, the time it would take to breach and reload every two shots coils very well mean the difference between life and death.
Final call, of course, goes to Eian if there's any sort of controversy over that shotgun...just bugged the he'll outta me being into shotguns myself...^^;
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