I own the OPR, and I can honestly say the buff was needed, despite the fact that it's to my disadvantage. Using the gun in Spar was ridiculous and frankly unstoppable. With the combined fire and stun it was basically unstoppable and I could just fly around the arena. I have since been using the m4 and it's a lot more fair. To sum it all up, it's reasonable that they buffed it, especially considering how easy it is to get tickets, I got the OPR in merely a day.