I've tried cleaning with the chamber brush that came with the COLT. Used it with a number of solvents / CLP / Power-Blast / WD-40.
If it is contamination from using the steel ammo rather than a 'final step' left out at the COLT factory, I should be able to clean it myself. (?)
It's hard to believe that COLT and their QC would allow a new LE6920 to leave the factory with something obvious like this.
I attepnted to email photos to COLT at the address shown on their website email@example.com
but it bouced back to me this morning as an invalid address.
Does anyone know of a new, valid email address for COLT?
Any suggestions on removing the contamination? Someone mentioned FLITZ metal polish / 0000 Steel Wool ?