Don’t mind different melee, but here is my thoughts about firearms:
Actually, I wanna see some “classic” gun set (and not that bullshit with unrealistic non-existent firearms), just like in C47 (that’s both nostalgia and common sense). So, something like:
Pistols: Silverballer/Silverballers (obviously unique one/ones), Kimber Warrior (actually, some kind of “modern M1911”; for tough bodyguards and assassins), actual old M1911, PM (both for some kind of bandits), Beretta 92FS, Glock 17 (both for regular law enforcement and bodyguards).
Concealable SMGs: Mini UZI for thugs, Steyr TMP for bodyguards who can’t carry large weapons.
SMGs: MP5A2, A3, A4, A5, UMP45, UMP9. First and second could be option for poorer fractions, other ones - for police on high alert and private security.
Assault Rifles: AKM and M4A1 (or AR-15, doesn’t matter actually) - both for the toughest guards, PMCs, Military, SWAT etc.
Shotguns: some “classic” shotgun with wooden furniture (R870/M500), Benelli M4 - both for private security and police. Well… As far as I am fanboy of John Wick movie, would like to see KSG-12, that thing’s really in Hitman style
Sniper rifles: actual Walther WA2000, or may be some kind of its modification, made by 47 himself… Doesn’t matter. Also, Sako TRG, also feels like fitting rifle for 47.
And Machine gun: M60; say hello to my little friend.