About No Guns Life ,Volume 1 By Tasuku Karasuma

After the war, cyborg soldiers known as the Extended were discharged. Juzo Inui is one of them, a man whose body was transformed, his head replaced with a giant gun! With no memory of his previous lifeor who replaced his head and whyInui now scratches out a living in the dark streets of the city as a Resolver, taking on cases involving the Extended.

When a fellow Extended showed up in Inuis officeon the run from the Security Bureau with a kidnapped child in tow and asking for helpInui almost throws the guy out. But Inuis loyalty to a brother Extended makes him take the job. Keeping the child safe wont be easy, since everyone wants him, from the mob to the megacorporation Berhren, which sends out a special agent who knows exactly how to deal with the Extended