One new: AK rifle Gas Piston New. Black finish. Overal length end to end is approximately 6 & 5/16"
Parkerized finish. It said parkerized on the box they came in, however I cant confirm exactly what type of finish it is. Sold as is
I don't know for sure the manufacture of these. They look to be good quality.
This is a standard sized AKM gas piston