Lonex POM Expanding Piston Head for Standard Airsoft AEG Gearboxes

"This Lonex, SHS/Rocket, and RA are my favorites. Their o-rings are a good fit for most Cylinders I have put them in and the porting is usually good enough to create perfect seals. I'd say Lonex is right there with RA for how many different cylinders they work in. SHS/Rocket have only seen 1 or 2 that didn't seem to match the cylinder and swapping the o-ring for a different one fixed that.

The POM in each of those brands also seems to be pretty much equal and I haven't had any break. Definitely prefer POM over Al in my builds of 300fps - 450fps.
Can't go wrong with this!

"This is now my go to piston head for all my builds. From 18:1 all the way down to DSG builds, these can handle the beating. One of my mild speed DSG setups pushes out 40rps on the dot and I have had no issues with compression or durability. Lightweight and polycarb is the way to go. Grab 1 and try it!

"I'm not sure what Matthew P. was doing wrong but I have had zero issues with this head. I assembled and disassembled my piston assembly several times while working on my tuning and adjusting things and I haven't noticed any wear, even on the screw head. The build is good, I got flawless compression using this and an Angel Customs steel cylinder and Lonex cylinder head. Great quality, solid piece, just be sure to use threadlock when putting this together with the piston.