Oakland Raiders linebacker Bruce Irvin delivered a parting shot at his former organization Tuesday.

Irvin is one of the central pieces in a lucrative free-agency haul for the Raiders, and is optimistic about his role in a revamped defense.

The 28-year-old starred on the vaunted Seattle Seahawks' defense at strong outside linebacker over the past four seasons, but felt the club hindered his growth. Irvin was selected 15th overall in 2012, incidentally the last time the Seahawks opted to use their own first-round pick.

"I honestly felt like if I stayed in that (Seattle) system, I don't think I ever would be the player that I think I can be in this league, and that's being a pass rusher," Irvin said Tuesday on SiriusXM NFL Radio. "SAM outside linebacker is cool, but you can do your job the whole game at SAM linebacker and you'll have two tackles.

Irvin believes he's entering the peak of his career now, and will be paired with burgeoning superstar Khalil Mack in Oakland.

"I haven't even scratched what I know I can do, man," Irvin said. "Like I said, Seattle kind of limited me in that defense -- and I did the best that I could do -- but I haven't scratched my surface. I'm far from it. I still have a lot more great years, and a lot more things that I have to prove."

Boasting a bevy of postseason experience that most tenured veterans in the league don't possess, Irvin is expected to be a major part of a rapid culture change in Oakland this fall.