Recommendations: Manga with guns

Kinda looking for manga where either the protagonist has a gun, or guns exist in universe, or something to do with guns My love for medieval fantasy only gets me so far without feeling burnt out

Things I read that kinda fit the criteria:

-Trigun maximum

-No guns life

-Black lagoon

-The promised neverland

-Golden kamuy

-The violence action

-Blame!

-Fullmetal alchemist

Thanks in advance!