There are a few. The APO: https://thesportingshoppe.com/produc...dular-chassis/
The MDT ESS Folding: https://rifleshooter.com/2018/07/mdt...-stock-review/
The XLR: (about the cheapest) https://xlrindustries.com/products/e...nesium_chassis
Most are pretty expensive. You can also get the LAW folding adapter. Any AR buffer tube style will work.
https://www.lawtactical.com/
I also PM’d you some stuff.
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