I thought I would share what I found to be a great option to allow you carry a handgun with the bino harness. Simple and I like the retention along with the speed to deploy the handgun.
Good morning, Sir, and that setup looks like it works a treat! If I may be so bold, you may wish to do some research into the Serpa. There are a significant number of reports of the retention mechanism failing and the handgun having to be cut out of the holster body. While I am sure the odds are low, I would hate to hear of this occurring just as you came around the corner and were confronted by Ms. Brown, Fuzzy, and Angry.