If I am understanding correctly then the idea of combining the blaster turret with a Y wing's forward armament then this would give an Attack rating of 4 at range 1. Standard forward armament of 2 + 1 for blaster + 1 for range 1 as it is a primary weapon.
That seems too good, it may work for the HWK with Attack 1 but it is available for the Y wing as well.