Guns III?

Oh, it's Young Guns III!

I understand that Emilio and Lou are not young anymore, but the adjective is kinda critical to appeal to nostalgia, particularly since "guns" is such a generic noun.

Boosie can drop "Lil" and still be recognized; Lil B cannot.

Weapon 5 comes 35 years after the original, much like fellow '80s hit follow-up
Gun: Maverick, and the fourth Cop movie, Cop: Axel Foley.

The Fast and the Furious franchise is an outlier, being able to toggle between "fast" and "furious" in titles.

Guns III? Nope.
Young III? Nope.
Weapon 5? Nope.
Lethal 5? Okay, that works.