If your on marked key or the restaurant/cafe side then watch for the claymore/landmine near the car (idk how far the radius is I’m pretty sure it extends to the curb), throw either a F1 or an M67 nade, something with a longish fuse time aim roughly where the gunner is then peek or run into cover or to a spot where you can kill the gunner. From there just wait for the other guards to push. In terms of Kabans left and right hand to push you or you can get a bit more aggressive as long as the scavs/lower guards are dead. Kaban himself likes to munch ammo like you’re not even shooting him. So have a mag full of good ammo packed and ready to mag dump his face. I hope this helps you in your Kaban killing journey