Excellent Choice for PS90 SBR
I highly recommend the B&T Flash Hider. It is of excellent quality and consistently manufactured to a high standard. Arms Unlimited shipped fast and at a reasonable total price. I purchased the B&T second, and the CMMG Flash Hider first, and while both are good options - I really think the B&T is simply a superior product. Concentric, looks great, high quality, the finish stood up to me torque-wrenching it down. The CMMG hider is by no means "bad". I just prefer this one. I think for most folks, this is the move for your PS90 SBR on the CMMG barrel (or FN factory chop).