If you're looking for manga similar to Golgo 13, you might like these titles.
Sengawa's day job is as an accountant working for the police. But at night, he transforms into a ruthless assassin bringing death to anyone who deserves it. Those who have been wronged and whose grievances the police can't - or won't - listen to, turn to The Man With A Thousand Guns to avenge their suffering.
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If you like Golgo 13 anime then you'd probably enjoy reading Dendrobates. Both are episodic action stories about a assassin/hitman and both have tons of violence and gun porn.
When you're the infamous prodigy hitman known only as "Fable," many things come easy. Being a normal person, however, isn't one of them. In fact, being told that he can't kill anyone for a while may just be the hardest job Fable's ever taken...
The case files of the detectives at the Shinjuku Police Station paint an unapologetic picture of the worst of human nature, the horrors of everyday life, and the people that are the products of them. In this society, abused children grow up twisted, and traumatized victims turn to violence for revenge. The line between victim and criminal is often blurred when even the worst offenders are those society once failed to save. Left behind in the passing of the years, former detective Iida Kyouya must once more pick up his gun.
When retired cop Hiraga Raizou gets a lucrative gig working for a shadowy government organization known as the SS Agency, he is in for a rude awakening. The first day on his new job, he comes across a grisly murder and a lone little girl who’s far from innocent. She’s Suzukaze Miharu, an 11-year-old master assassin–and his new partner! The arrangement is simple: she kills, he cleans up and hides any evidence. Sure, the pay is great, but how much blood is Raizou willing to get on his hands?
Codenamed Alice, she's an expert assassin......well, a trainee assassin. But she's still highly-skilled with various forms of firearms, and she gets the job done...
Kikuno Kei, nicknamed "Kay", is a normal university student and a part-time hitwoman with John Wick like skills.
A bold and bloody tale of quirky assassins, lost rights, and found family.
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 life—or who replaced his head and why—Inui 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 Inui’s office—on the run from the Security Bureau with a kidnapped child in tow and asking for help—Inui should have just thrown the guy out. But Inui’s loyalty to a brother Extended makes him take the job.