holster needed for Rugar M-2 with optic

[LaGriz]

My Rugar Mark-2 has a 6" BL with a reflex sight mounted on a rail. I'm in need of a holster to care on hip belt of my pack.
A chest rig might be another option. Presently carry a bino chest rig with a Zeiss 8X45 RF bino. I like the arrangement for the most part. I'm hoping to get some feedback on what might work for this auto pistol.

Thanks in advance
LaGriz