Regular oils in the gas system will bake into a hard carbon that becomes difficult to remove. Use any kind of synthetic lube on the piston and magazine tube as they resist heat much better. I've had great luck with BreakFree CLP on gas systems. After four or eight rounds of trap/skeet, literally just wipe off the magazine tube with a rag in a single pass, re-spray, done.
X2, I use CLP on my 390’s.




















































