Well, I would not be real happy with a lever action in combat, I presume you mean military combat or some form of serious civil disturbance with many actors that are all violent.
That being said, I guess a Marlin in .357 magnum.
Get one of those belt buckle 6 shot plastic .38.357 ammo holders and empoxie it to the left side of the reciever to give me a 'side-saddle' like tac-star 12 guage mounts.
Add to it, a wood handguard that wraps around the stock (like the old military versions of the Winchester 95) so as not to burn my hands after firing rapid fire.
Add an Ashly reap peep and either a very short scope with long eye releaf or some form of Aimpoint.
Then, a belt with at least 30 loops for .357 mag ammo and a good lightweight .357 revolver (say a 3 inch Ruger GP-100, magna-ported).
And hope for the best.
Deaf