If you were a serious competitor, you wouldn’t be buying an off the shelf rifle…you’d be building.
Additionally, if you bought the rifle online, that means you had the opportunity to inspect the rifle before taking delivery, and should have seen that the brake wasn’t correct. If you didn’t…that’s kinda on you.
Springfield has been known to play fast & loose with the furniture/accoutrements that have been coming with the Saints; I seem to recall a few instances where they were subbing forends from different, lesser models.