carbon buildup on piston

[jg1967]

I have a Kel Tec SU 16B. There is some carbon buildup on the piston head that is hard to get off. I normally use Breakfree CLP to great effect on cleaning but it won't get all of it off. Any suggestions?

 

[jg1967]

And I just realized we have a separate section for LONGGUN maintenance, silly me, sorry! :fie: