I went on the Armson page and was looking at OEGs since it's been years and I was wondering what the closest they offer to a singlepoint for my GAU-5/A/A clone. What did I see but:

"Currently unavailable. Look for our new round-body "Retro" OEG coming in November 2019!"

https://www.armsonusa.com/armsonoegm16.html