You can get actual shotguns from the Necromunda weapons sprues. There are the pewter sprues that have 2 or 3 of them and then then plastic ganger spures that will have several shotguns.
you probably could. There's little pyramids on the joint to make them slot into the body properly, just cut those off and you should be fine. It might look a tad bulky, I'm trying to remmber sizes.
Definitely browse around online and in the Online Store for IG pics/Scout pics and see which shotguns are going to fit your theme. The arm could be perfectly sized but look completely out of place to you personally. I think TauFire summed it up nicely, but make sure to get that look of them before you decide.
think i'm gonna go with marine scouts with shotguns for my veterans, they just look like imperil guard on steroids, which is what i'm going for anyhow.
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