Loose Barrel

[The Mafia]

I have noticed the last few games I've played that my barrel (Lapco Bigshot) is coming loose. It has never completely unscrewed, but it does get wobbley. Has anyone else had a similar problem? If so did you find a solution? It gets a little annoying having to constantly screw down your barrel while the paint's flying.:|

[Meph]

Make sure you still have the O-ring on the barrel.
And tighten down the front 2 screws tightly.