122 gun weapon items
The Forever catalog holds 122 gun weapon items, topping out at item level 90 with 90 Epic Warrior Gun, 90 Green Warrior Gun, Toxin Injector. Every weapon in the Forever catalog, from the vanilla dungeon and raid drops to the new Forever additions, sorted by item level with daggers, swords, staves, polearms, bows, guns, and wands as filters.
By quality: 44 uncommon, 34 epic, 26 rare, 10 common, 8 poor. Item levels run from 3 to 90, for characters from level 1 to 60. 29 bind when picked up and never reach the auction house; 93 can be listed.
The highest item levels here: 90 Epic Warrior Gun (90), 90 Green Warrior Gun (90), Toxin Injector (83), Larvae of the Great Worm (81).
One profession makes 14 of them: Engineering (14). The rest drop, are sold by vendors, or come from quests.
Source: World of Warcraft: Forever game data and Blizzard's Game Data API. Updated with each game build.