Lonex Ultimate Ball Bearing Polycarb Silent Mushroom Piston Head for Airsoft AEG

"This is compatible with the ASG ULTIMATE UPGRADE CNC ALUMINUM CYLINDER HEAD - VERSION 6 (P90 / THOMPSON)

The piston head made my shots much more quiet and it sounds more like HPA, so its a good choice for P90 users when paired together.

"Amazing piston head, upped the fps in my SR25 from 420 to 465 as well as making a much lower noise output. I would recommend this to anyone and will get this for all my guns.

"put this in my Cybergun F.A.M.A.S. DMR and it makes great compression and absorbed a lot of force from the cycle and made the gun really quiet compared to stock. the only polymer part is the red part, EVERYTHING else is METAL!! :) nothing bad about this product, highly recommend

"Put into a JG P90 and it fit perfectly. Great product and materials used. Paired with a ASG v.6 cylinder head and a good nozzle i am hitting 380 to 390 with an M90 spring. about a 30 to 40 fps jump. It silenced my gearbox slightly and you hear a pop more than a bang. Highly recommened product.

Pros:
Fit just right
Fps boost
Silenced my shots pretty well

Cons:
None yet

"Definitely quieted my gearbox in my ICS M16A3. Perfect fit with the upgraded ICS piston and cylinder. Would purchase again.

"I bought this piston head and an ASG ultimate silent piston head for my custom SL8 DMR build, and performed great. Quieted the gearbox, increased fps, was generally awesome.

I had a couple problems with mine, though. First, the screw kept backing out, causing the piston head to separate from the piston head. Not a big problem, probably an easy fix with some thread locker. Second, the aluminum ring around the head cracked, which messed up compression and also caused the threads to strip. Now, my gun shoots 430fps with a .20 at 16rps, so it may have just been too much for the head. Either that, or it was a just a bad head.

For a regular AEG (400 fps or less) I highly recommend this piston head (paired with the ASG cylinder head). Its inexpensive and highly effective. For higher fps applications, I recommend going with an aluminum head.

4 out of 5 only cause mine broke.

"It's a snug fit into a angel custom cylinder and a tight fit in stock vfc cylinder, was kinda disappointing since it caused piston head and body to not glide into the cylinder easily and cause destruction of multiple pistons and major fps loss from the friction. Feels like a good quality but the head sizing was too big

"Two issues. Both of them likely because I am new, so keep this in mind new people.
Buying a piston head without the corresponding cylinder is going to cause you problems. I installed mine thinking that the tight fit was awesome, but it dropped my FPS from 360 to 180. Too tight. I had to switch it out.
When I put it into a build that could fit, it doesn't magically make the gun silent. That might seem obvious, but it's advertised as silent. Just be aware that there are other layers to the noise making process, mostly because of the motor and gears moving.

This is probably a good product and not worth a low rating, but I feel like it was falsely advertised to those with less experiance.