carbon buildup

[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?

[Jes]

I like Marvel Mystery Oil and a brass brush for carbon removal. Cheap and effective + it smells good. I mix it 50-50 with synthetic 5W30 for a good all around light lube.

A lot of the info out there on gun lubes is very subjective, but the fact is I use the MMO and it works for me. A quart of MMO is about $3.50 and another $3.50 will get you a quart of syn 5W30.

If this isn't strong enough get some mineral spirits.

Good luck.