Nothing to it, fitting a barrel and matched bolt is the easy way. You may need to make adjustments to the gas system. The bolts are the same but on any Ar based system they need to be matched to the barrel so it’s typically to buy bolts and barrels as a package together. 6.5cm also runs a bit higher pressure than 308 and some bolts may not be suitable for 6.5cm. JP high pressure bolts are excellent.
One example
Proof and Bartelin are probably as good as it gets. I’ve also had great results with the JP barrels.