According to DaiShiHUN, you can use his mod but credit him, which is what I did. Now, you can use, improve, disimprove, mutilate, dismember, ruin etc the Combat Shotty replacing file I have right here, but you might wanna credit me. Nothing too spectacular, just say I had the idea for this model to replace the Combat Shotgun which looks like a f-ing PPSh-41 with the clip in a different place.
File credits
Me:The Combat Shotgun replacer DaiShiHUN:Model and texture
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Before you send your ratings, steal claims, etc, hear me out. I took DaiShiHUN's Classic Quad Barrel Riot Shotgun (http://www.nexusmods.com/newvegas/mods/38811/?) and made the model replace the Combat Shotgun, along with giving it a 4 round clip(in SW you get 4 rounds before you reload). If y'all want a larger clip, request it. Also, before you complain about the firing speed being very SLOOOOOOOOOW, keep in mind I didn't do anything with that. You can change that in GECK, you know. Anyways, special thanks to DaiShiHUN for his awesome post.