hi,
sniper turret does not go overcharge while it's active.
But it goes overcharge when you deploy it while some overcharge is going on.
And then even if overcharge goes cooldown, turret is still in that state until ammo is gone.
For example with new weapon talent "Future Perfect" or with "Acosta's Go-Bag".
With both works the same.
With Incinerator turrent, overcharge works like intended.
regards,
G