I got a nib bcg about two months ago and I've put about 3-400 rounds through it I called before I installed it asked how to clean grease an ect they told me to just shoot n wipe away and add a touch of grease on the rings other than that that's it but anyhow now it has bad discoloration the cam pin and the ejerctor piece is completely black and won't wipe off looks like I threw it n a fire. Anyone with this problem




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