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Hi there,

Just to add to the other solutions, the game has updated quite a bit and has a lot more options to choose from if you are lucky enough to get the weapons locked behind the RNG-lootboxes Activision calls Supply Crates (Surprise Mechanics!). A lot of the standard weapons have MKII or Mastercraft variants which will award you 25% more XP per gun (only for your weapon, not your actual level), during double XP weekends this will award you 50% more XP thus allowing you to level up your weapon at twice the speed.

I mostly played Classified or IX because you only need to get a shield and do a short "quest" to unlock Pack-a-Punch with the following perks:
- Timeslip
- Deadshot Dealer (more XP for headshots)
- Bandolier Bandit
- Stami-Up (Modifier slot)

I always had the free Elixir "Temporal Gift" on for those juicy drops (Insta-kills, Double Points and more importantly Firesales) during my games. It is recommended you go for weapons that have attachments available as well as Operator Mods since the latter can really improve the weapon (Mozu & Strife are perfect examples!). You can play on casual without modifiers to gain weapon XP.

Below are all the weapons up until DLC3 (Apocalypse Z):


STANDARD WEAPONS
Assault Rifles:
- ICR-7: Level 15 (Unlocked at level 5) - No Operator Mod
- MADDOX RFB: Level 16 (Unlocked at level 13)
- KN-57: Level 16 (Unlocked at level 21) - No Operator Mod
- HITCHCOCK M9: Level 16 (Unlocked at level 29) - No attachments
- RAMPART 17: Level 16 (Unlocked at level 48) - No Operator Mod
- VAPR-XKG: Level 15 (Unlocked at level 53)


Submachine Guns:
- ESCARGOT: Level 16 (Unlocked at level 12) - No attachments
- MX9: Level 15 (Unlocked at level 25) - No Operator Mod
- SPITFIRE: Level 16 (Unlocked at level 32)
- SAUG 9MM: Level 16 (Unlocked at level 44)* - No Operator Mod
- GKS: Level 15 (Unlocked at level 45)
- CORDITE: Level 16 (Unlocked at level 49)
- M1927: Level 16 (Unlocked at level 1) - No attachments
*: also a starting weapon


Tactical Rifles:
- SWORDFISH: Level 17 (Unlocked at level 4)
- ESSEX MODEL 87: Level 17 (Unlocked at level 16) - No attachments
- ABR 23: Level 17 (Unlocked at level 37)
- AUGER DMR: Level 17 (Unlocked at level 52)

Light Machine Guns:
- TITAN: Level 16 (Unlocked at level 9)
- HADES: Level 17 (Unlocked at level 28)
- VKM 750: Level 16 (Unlocked at level 40)
- ZWEIHANDER: Level 17 (Unlocked at level 55) - No attachments


Sniper Rifles:
- SDM: Level 16 (Unlocked at level 17) - No Operator Mod
- PALADIN HB50: Level 16 (Unlocked at level 33) - No Operator Mod
- KOSHKA: Level 16 (Unlocked at level 51)
- OUTLAW: Level 17 (Unlocked at level 54)


Secondaries:
- WELLING: Level 13 (Unlocked at level 1) - No attachments
- MOZU: Level 13 (Unlocked at level 8)
- M1897 TREBUCHET: Level 13 (Unlocked at level 20) - No attachments
- STRIFE: Level 13 (Unlocked at level 24)
- RK 7 GARRISON: Level 13 (Unlocked at level 36) - No Operator Mod
- SG12: Level 13 (Unlocked at level 41)
- HELLION SALVO: Level 7 (Unlocked at level 47) - No Operator Mod
- MOG 12: Level 13 (Unlocked at level 50)


Free guns added by Treyarch
- GRAV: Level 16 - No Operator Mod
- MP40: Level 16 - No attachments


DLC RESERVE CRATE GUNS
Assault Rifles:
- M16: Level 16 - No Operator Mod
- PEACEKEEPER: Level 15 - No Operator Mod
- SWAT-RFT: Level 15 - No Operator Mod

Submachine Guns:
- DAEMON 3XB: Level 16
- SWITCHBLADE X9: Level 16 - No Operator Mod

Tactical Rifles:
- S6 STINGRAY: Level 17

Light Machine Guns:
- TIGERSHARK: Level 17


Sniper Rifles:
- HAVELINA AA50: Level 14 - No Operator Mod
- LOCUS: Level 16 - No Operator Mod
- VENDETTA: Level 16


Secondaries:
- ARGUS: Level 13 - No Operator Mod
- KAP 45: Level 13 - No Operator Mod
- RAMPAGE: Level 13 - No Operator Mod
- BALLISTIC KNIFE: Level 7
- REAVER C86: Level 7 - No Operator Mod

Happy grinding!