HQ chance on New Weapons

What is the starting Quality on Mailbreaker, Obelisk, Rampager etc. When you have all HQ besides the flawless head?

Sum up all the optimal levels of HQ items, divide by total optimal levels and multiply by 500. (See mooglebox for optimal levels)

For Astrolabe, this would be: 150/230 * 500 = 326 (rounded down)

Thank you!