Alot of teams are sponsored by Virtue.
But it is true that alot of pro teams use aftermarket internal parts in their guns, that they arent supposed to. And then when they send them in to be worked on the aftermarket parts disappear and are replaced with stock ones.
But they couldnt get away with replacing external parts, or the whole internals of a gun. Especially the higher profile teams, the sponsors wouldnt allow it.