I have been running this Gemtech G5t for a while now. It started its use on my PWS MK107 upper and not is run on a custom upper with a 10.3" DD barrel (MK18). As you can see from heavy use the first baffle has been taking a beating. This is not anything new or weird, this is normal wear from use. While I do not count the number of rounds through the suppressor I am sure it is upwards of 5k+.
The blueish tint is from oxidation of the oxidized copper residue and perfectly normal. It wipes right off with some CLP
or whatever other gun lube you want to use.
or whatever other gun lube you want to use.