Is there any commercially available barrel with Gas Block/Castle Nut? (a la Knights)

AR/M4 AR General Discussion
1

I’m wondering if there’s any commercially available barrel/gas block combo like that of Knight’s or Barrett, NOT upper

I Googled hard, but nothing came up.

2

The gas block on the Q Honey Badger looks similar.

https://www.liveqordie.com/products/honey-badger-barrel-assembly/