IAR-81 C
BR 2

Reasoning: (When was the last time you “DIDNT” see anyone flying this?)
Comparable Aircraft at BR 2
IAR-81 C (350kg payload, 2x 20mm cannons, 2x7mm Mgs, Moderate Performance)
- P-40 E-1 (450Kg payload, 6x50 cals, Moderate Performance)
- P-38 G (6x M8 Rockets, 20mm cannon, 4x50 cals, High Performance)
- A6M3 Reisen (120Kg Payload, 2x cannons, 2x7mm Mgs, Unmatched Turn fighter)
*Note A6M3 Is more of a fighter than CAS. It “can” ground strike but trades it for unmatched dogfighting ability)
This plane has a little too much going for it at BR 1, it overshadows all the other options and is widely used across multiple BRs (if not all)
Alternative
The alternative would be to Change the payload to 2x rockets\2x50\1x250. Even then this plane would probably still be BR 2 (But this plane is perhaps too beloved to change its payload at the moment)