TSA isn't going to let you anywhere near the gate with that. They don't care about deactivated. Looks real/it's real as far as they are concerned.
Since someone complained about a lack of sources:
https://www.tsa.gov/traveler-information/firearms-and-ammunition
Realistic replicas of firearms: No.
Edit: They've changed the page. Now it says:
Replica firearms, including firearm replicas that are toys, may be transported in checked baggage only.