Shotgun

Walker served in the Vietnam War with Frank Castle ( Punisher) Now he seems to work for an unnamed federal law enforcement agency so secret that even he doesn't know its true name(whatever it is, it evidently has very deep pockets- as he says that nobody ever asks to see his expenses vouchers).

Creation

 Shotgun was created by Ann Nocenti and John Romita Jr in 1989 and first appeared in Daredevil # 272.   

Weapons & Abilities

Shotgun is a highly trained operative and marksman. Shotgun has been equipped with a number of high-tech weaponry including a specialized scoped shotgun that fired explosive, concussive, combustible and disintegrative rounds in a rapid succession. Shotgun carried numerous firearms including a pistol hidden in his wrist gauntlet. Shotgun had at least two ammo belts on him and he wore glove/arm sleeves with a row of tiny spikes on them for close quarter combat.