Quality and Stormshields

By wraithstalker, in Deathwatch Rules Questions

I'm confused by the Stormshield in regards to item quality.

It's a forcefield by list, and includes a protection rating.

It adds AP to body and one arm.

It can be used as a defensive weapon

If you Mastercraft it what happens?

1) Obviously it has the Overload of a mastercrafted forcefield.

2) Does it improve its granted AP?

3) Does it gain a bonus to attacks and damage when used as a weapon?

I suspect its only the first, but the rules did not seem clear.
Does the mastercrafting "know" what kind of item the shield is, or does mastercrafting apply to all uses of the item in question?

Mastercrafting reduces the overload value and also adds 1AP