If people are really that afraid of recoil from the chain... don't forget, your aim is pretty much the same. The only difference is if you're going to get motion sickness. For the shotgun, yes sidestepping works. The chaingun, is pretty effective even while standing at s1, as long as you know how to dodge wear armour, and most importantly, have backup (preferably be the backup)
Ironically, pro mara's can be avioded.... as they jump, run forward and under them. often, they just can't respond that instantly. if they do, your fucked. But still, it saves the s1 hummie very often. So, if you're game, play matador with the mara.
If you have commonsense, unlike I, don't.
Shotguns, shotguns, shotguns... oh the joy! 10 hummies with shotguns...*drools*
*Hides*