Check out the Sam Andrews monarch shoulder holster.
Andrews Custom Leather - Monarch Shoulder Rig
I have 2 of them (glocks) and they are comfortable and of high quality.
He had the components available for my Glock 17/22 and I got the holster within a week. The holster for my Glock 20/21 took a little time because the components weren't ready.
Mention to any holster maker that the holster is for Active Duty Military overseas and you should get a rush put on the order.