the weapon varies due to soldier rank, so 1 armor , 5 diferent weapons built in the armor , dunno how it´s shows in the drop down list
Didnt know it had different items, cool touch, thought it was just the cosmetic changes, could that info be added into the codex entry? And the weapon stats/intended use case? Does that happen with any other armor? Is that the main benefit of promoting units?
For anyone wondering the items are and not wanting to manually equip Gravis on every rank:
Primaris: Boltstorm gauntlets
Sergeant: Flamestorm Gauntlets
Veteran: Boltstorm Gauntlets that look like they have drum mags?
Lt: Boltstorm gauntlets v2 + rocket launcher
Captain: Boltstorm v1 + open hand
Unfortunately I couldnt see any of the stats
EDIT: Played with the other armors:
Phobos armor on a captain gives a backpack with a Haywire Mine (proximity grenade)
Techmarine on Veteran gives a Tarantula Deploy System
Lt gives Thunderfire Deploy System
Chaplain can only be used by veterans and Lt, gives the Crozius
Librarian requires veteran or higher; gives shield, lockdown, speed + shield in that order