SBR + full size or K can

B&T’s new print-xh cans are calling to me like the green goblin mask. Lighter than most other cans and at least as good as a polo k, 400 less than a cat wb.

But there’s the questions: I’m left handed and keen on not gassing myself with my 12.5 mid. 1050 + sales tax also isn’t cheap compared to 732 for a polo k. Anyone have experience tuning a 12.5 mid (It’s got an SA block and A5 buffer)? Thoughts on the b&t cans, and full v k cans on an sbr?