Double K That was probably 12 years ago, I have not looked at it recently but I assure you it was coated with something that came off in my chamber back then at least the stuff I had did, I won a full case of it in a raffle and ended up selling it at a gunshow.The rifle was a Colt carbine that I got when the first flat tops came out.
I live in realville, I don't regurgitate myths.
What you think was "Lacquer buildup" was CARBON BUILDUP.
The steel case being less ductile and therefore less efficient than brass at preventing carbon flowback in the chamber.
This isn't a problem when the cartridge has a slope like the 7.62x39, but can present issues with straight wall cartridges like .223/5.56
Decades ago some internet nitwit blamed it on "lacquer buildup" and the internet ran off in glee.... truly believing that instead of taking ten seconds to cogitate on:
1. You won't get "lacquer" to melt off a steel case using a match. Try it.
2. That hot "lacquered"steel case? Why is it not splashing "hot lacquer" all inside the action?
3. Commie guns don't experience such "lacquer buildup" and run just fine.
4. Commie guns get as hot as US guns.
5. Understanding how to clean your gun is important.
In short....it ain't the coating.....it's the STEEL CASE.
My Colt Commando has seen around 2,000 rounds this year, all steel case, some Tula, some Wolf, some Monarch.......not a single stoppage. And I haven't cleaned the chamber or barrel since Thanksgiving.
I run her nice and wet with a silencer too.
9mm steel case? My Glocks and Hi Powers eat it up.