Answer
Duplicates 1

Vulcan and Hornet M1 is available only if you are below Second Lieutenant rank, if you are above that rank it means you can already get M2 modification so you wont be able to get M1.

so i cant upgrade it only buy the next modification
thats really stupid.But thank you for your help

If you would be lower rank then you would be able to get M1, but since you are in rank where M2 unlocks already, then you can't get M1 anymore.

Hello i have a question.
I upgraded my m0 freeze to m1, and it' 10 out of 10. I did this with my isida from m0 to m1, and i got to buy isida for "free" (because i had already) So i have freeze m0 with 10/10 upgrade, Why can't i get m1?
And if i can't get m1 ( for some reason) can my m0 freeze be downgraded to m0 0/10 upgrade and the chrystals be returned to my account>?
Cause that's really cheap how that's done...

If your freeze is m0 and you have fully upgrated it to m1 (10/10), you'll get the m1 modification of the turret for free BUT if you have the m2 modification unlocked, you'll have to purchase the m2 at it's price. I don't think you'll be able to get the crystals you spent upgrating back.
Customer support service by UserEcho
Vulcan and Hornet M1 is available only if you are below Second Lieutenant rank, if you are above that rank it means you can already get M2 modification so you wont be able to get M1.