Colt 6920 dry film lubricant

[ando35]

Does anyone know how long the spray on, dry film lube they put inside the upper receiver lasts?

I ask because if it is a couple hundred rounds or so, it can be an indicator of newness, or making sure you got a brand new upper.

[samuse]

I've had the stuff stay on for thousands of rounds, but I don't use any solvents or anything to clean. I just wipe out the upper and relube. Heavily.

I know acetone will take it right out....