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Here's a direct link to Windham to view the quad rails they have available for what you need.
https://shop.windhamweaponry.com/product/hgd-ww/

Hi Christopher and welcome. I would contact Windham Weaponry Customer Service for the exact spec handguard you would need for fitment at Sales & Customer Service: 855-808-1888 - Cheers and stay safe!

https://shop.windhamweaponry.com/product-category/308-handguards-parts/