TMZ Sports has obtained video of the moment Buffalo Bills lineman Adolphus Washington was confronted by police while handling a gun in his car ... and the standoff is VERY intense.
Cops stormed Washington's 3-wheeled Slingshot vehicle as they were clearing out a party at a Cincinnati-area water park. Cops say they saw Washington reach down and pick up a Glock.
Officers screamed at 24-year-old Washington to keep his hands up and get out of the car -- as Washington tries desperately to explain the situation.
Once he's in custody, one of the officers asks Washington, "Why the hell would you have that gun in your hand?