Retro Arms CZ Reinforced POM Piston Head for Airsoft AEG

"Similar to what you'll see on Lonex's listing here, the Lonex POM and RA POM are my two favorite piston heads. SHS/Rocket is in third place because I've had some cylinders that the SHS/Rocket doesn't get a good seal on. However, everything I've ever put the RA or Lonex ones in have been able to seal fully. Porting is good, POM material doesn't have the same twang sound as aluminum, and I've never had one of these break.

"I've installed this piston head in my last two builds. Very impressed with the quality and fitment. Seals up nice and provided consistent FPS readings shot after shot.

"I've had this cylinder head for some time. Its probably the best on the market. Seals great, it has my blessings. But it does not seal in a ZCI cylinder, the diameter in those is too large. This is better suited for narrow bore cylinders.

As for consistency, I'm getting 403-409 fps with .25's using this.

"Junk. The threads retaining the piston head are set in the POM instead of a metal insert. Can't threadlock them as a result - methacrylate threadlockers destroy the POM material.