CYMA produced nylon-fiber full-steel rack piston. This is the piston that is proving very popular on the main Facebook groups and forums.
Nice quality hex shaped reinforced piston. The Piston head is plastc and held in with a retaining screw, it's looks pretty durable, It's 15 teeth so if you need to correct the AOE you'll need to shave dow the 2nd tooth. The rack isn't locked down so you may want to super glue it before use.
Weight: 27.2 grams.