Haha! Yeah, thats sort of what I'm thinking because I love the G36 -- but it'll be 5.56. Not real interested in 300BLK or non-NATO calibers generally. I'm not real interested in non-NATO calibers. Just NATO for me! (sorry. I need to keep telling myself that to maintain some semblance of self-control.)
Still, I doubt I'd shoot it much. That's what my 10.5 416 project is for.
So many irons in the fire, and I keep adding more! Just picked up a Williams set trigger set up with a PSG1 wood grip. That'll be going on a 91 I have in wood furniture, but I don't know how long I'll be able to resist getting a different beater 91 to rebarrel, or dig up an SR9.
You could buy a barrel wrench, mandrel, and switch between the two at your leisure.