An random idea for both weapons and sentinels what if weapons had an attachment mod slot similar to the ones for warframes? And Sentinels had a Aura slot? For weapons the attachment slot could have a gear symbol and possible mods for this slot could be Stabilizer, Hush/Suppress, Quick Draw and Fast hands. And possible Sentinel Aura mods Coolant Leak, Fired Up, Self Destruct, Spare Parts.
Bonus: random weapon(s) idea: Infested Corinth and Infested bolt action sniper ( like the Vectis) and De