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Compilation of photos which were digitized to create Duke Nukem 3D's shotgun graphics. Somewhat small resolution, but the content comes across. If you look closely you can see the radial-lugged bolt-head on the bolt when the action is open, a dead give away of it being a Winchester 1300.
So this is a shotgun without a shoulder stock, meaning there's strictly no easy way to aim this gun at anything but pretty close distance, and being less steady due to not being able to support it solidly against your shoulder, it's thus slightly less easy to pump. Believe it or not, but shotguns like these can actually be viable, if you put in enough practice and training to get really good with them, and I can imagine a dude like Duke Nukem does, and he's certainly strong enough that operating it comes with great ease to him.
IRL, I would suggest putting a laser sight on a shotgun like this to make it easier to 'point shoot' with the thing, but the scatter effect of shot does let you kind of eyeball it, Duke certainly does so.
Speaking of which, Duke Nukem 3D actually depicts shotgun spread in a reasonably restrained and realistic manner, as opposed to many much later 'realistic' first person shooters which depict shotguns with 90 degree spread from the muzzle and as having their projectiles evaporate after 10ft. You can actually get pretty good hit patterns with this shotgun in the game at distances like 35yds, and while we're on this subject, this is something that the pump-action shotgun in Doom and Doom 2 does as well, providing you with some useful 'medium range' capacity.
Funny how older and more fantastical shooters with far less of a focus on realism gets shotguns better than many later ones which claim realism as a main selling point.