I believe that Wilcox also makes the Caracal line of firearms here in the US?

"Features and benefits of the upgrade include a cold hammer forged steel barrel, 100% compatible to the original barrel, increased thermal stability and a new lightweight alloy receiver to replace the old polymer receiver, thereby increasing strength and stiffness. The new STANAG magazine well will offer greater compatibility between magazine types, allowing more flexibility for procurement as well as for sourcing spares in-theatre from NATO allies on multinational ops. All upgrades are intended to maintain the same form and function as the original design and do not impede the operation of the weapon."

https://www.joint-forces.com/defence...od-g36-upgrade