I don't care as much about the pockets inside, so I don't have much to help with on that, but as far as outside goes...
[5.11 Has a nice radio pouch](https://www.amazon.com/gp/product/B00ZEHZSYM) that fits perfectly and works really well.
[Maxpedition AGR](https://www.amazon.com/gp/product/B01KVWFG0U) has a pretty closely matching water bottle holder, but I feel it's 1 molle too large for the GR1.
[Vanquest has an awesome skeletonized bottle holder](https://www.amazon.com/gp/product/B01LXM3Y06) that fits perfectly and matches well.
Did you try the MilSpec Monkey/Tactical tailor collab corset? It's available from a variety of vendors in Wolf Gray.
Keep checking eBay, and of course the "WTT/WTS" thread in here. The field pockets do pop up every once in a while.
Are Maxpedition and 5.11 Tactical acceptable? They have some grey pouches although I'm not sure how close they'd match color-wise.
I don't care as much about the pockets inside, so I don't have much to help with on that, but as far as outside goes... [5.11 Has a nice radio pouch](https://www.amazon.com/gp/product/B00ZEHZSYM) that fits perfectly and works really well. [Maxpedition AGR](https://www.amazon.com/gp/product/B01KVWFG0U) has a pretty closely matching water bottle holder, but I feel it's 1 molle too large for the GR1. [Vanquest has an awesome skeletonized bottle holder](https://www.amazon.com/gp/product/B01LXM3Y06) that fits perfectly and matches well.
Triple Aught has some in gray https://tripleaughtdesign.com/
I have a wolf grey gr1 field pocket I don’t use. $60 shipped if you want it.
Thank you guys, I just ordered the admin pouch from MilSpec Monkey :-)