Converting 5.56 AR15 to 300 Blackout

[Mighty Mouse]

Is it as easy as just swapping the barrel?

I have an AR Stoner kit gun that I put together years ago as a cheap truck gun and have barely ever used. I have a hankering to experiment with 300 Blackout and figured that converting this 5.56 AR Stoner might my cheapest option if it's truly as easy as swapping the barrel. Do I also need a new gas block and/or gas tube? Should I get an adjustable gas block? I will be putting a suppressor on the 300 Blackout FWIW. Photo below of the conversion candidate for reference.

 

[Pescetism]

Yes, it's usually just as easy as swapping a barrel. You may want/need to switch buffers and/or buffer springs but not a requirement in my experience. I'm a fan of adjustable gas blocks, suppressor or not, but again not always a requirement.