I will edit this thread later for more detail, but for now I'm going to leave this link in-case someone else would like to give it a shot-in-the-dark like myself.
These sorbo pads are shaped differently from the usual PSS2 sorbo pads-- the sorbo pads in the link have a much larger hollow cavity in the center.
They come in two sizes 3/16'' and 1/8''.
1/8'' probably reduces sounds less, but does not lose as much fps as the 3/16'' and most likely deteriorates slower.
I will be reviewing the 3/16'' later this week.
Noise Volume Reduction:
Stock/UTG Kit Piston *
Piston with Red Accuracy Cup *
The volume reduced by the sorbo pad is hardly noticeable.
If '0' was the quietest but still noticeable clap you can make and '10' were the loudest clap you can make then the sorbo pad would turn a 10 into a 9.
Frequency Reduction:
Stock/UTG Kit Piston **
Piston with Red Accuracy Cup ***
This in my opinion is more important than sound reduction. Lower frequencies are more difficult to hear, especially the older the individual.
Lowering the frequency changes the usual POP sound into a THUD sound. This makes a rifle shot more difficult to hear and more difficult to determine that shot's source. (e.g. It's easier to hear an instrument playing a high note rather than a low note.)
My Type 96 rifle is nearly maximized for volume/frequency reduction so even without a sorbo pad, no mock suppressor, and a m190 spring installed it's extremely quiet. All you can hear is a very faint 'thud' from the BB leaving the barrel. Surprisingly the sorbo pad reduced the frequency of my faint thud a little more!
[I can mention the mods if requested.]
The stock/UTG piston gets a lower score because the frequency reduction was not as much as the Red Accuracy Cup.
Vibration Reduction:
Stock/UTG Kit Piston **
Piston with Red Accuracy Cup *
The vibration reduction from the sorbo pad is two-fold. One, vibration is reduced due to the material absorbing the shock. Two, vibration has reduced because the force that the spring generates has decreased. The sorbo pad takes up space that the spring would otherwise have occupied.
The sorbo pad reduces vibration less for the Red Accuracy Cup because this piston head was designed for durability and reducing impact force. This means a stock/UTG piston would benefit more in terms of vibration reduction-- although hardly noticeable.
Price: *****
$5 is not necessarily a steal, but if you're planning to order other items from EVIKE, a five dollar increase shouldn't break the bank.
Durability of Pad: *****
So far I cannot give an accurate durability rating factoring in time and other outside factors, but I can say that the sorbo pad can take a beating (700+shots) and it hasn't shown any sign of wear yet.
[This section, and all others for that matter, may be subject to change in the future if new data arises.]
Durability Increase of Piston: *****
One of the primary attractions for AEGs using sorbo pads is a spike in durability increase. I have not tested a piston to failure (i.e. breaking), but in theory this sorbo pad will increase a piston's life by absorbing shock.
It's quite rare for a sniper rifle piston to break, but I'm rating this section a five because this is one of the reasons sorbo pads were made. How can I not give it a 5?
Ease of Installation: *****
- Clean the cylinder head so there's no dirt/grease (Rubbing alcohol is enough)
- Super glue the sorbo pad as centered as possible
- Wait for glue to dry
- Install cylinder head onto cylinder
- Celebrate
Doesn't get easier than that.
Installation of a m210 spring... it's nearly impossible. I tried and tried again, but I could not install it without the fear of tearing the sorbo pad. M190 and weaker springs are installed with no problem.
I have not tested the sorbo pad installed onto a self-polished/beveled cylinder head. Since there is a larger hollow cavity in the middle of the sorbo pad unlike PSS2 sorbo pads, I'm nearly certain that installation is possible on highly tapered cylinder heads as long as it's flatter near the circumference, but I cannot guarantee this.
Accuracy Increase: n/a -- Reason Explained below
Accuracy DOES increase
very slightly. But it's mostly due to a "side-effect" of using a sorbo pad.
Inevitably, a sorbo pad will decrease FPS ~5-15 (because it takes space in the cylinder) which in turn increases accuracy.
Given two identical rifles shooting the same BB's-- the rifle with the lower FPS, in theory, should be more accurate.
Miscellaneous:
- There is a 1/8'' sorbo pad available on the same website. Perhaps this one can be installed in conjunction with a m210 spring(?)<--[Issue mentioned in the installation section]
- Roughly a 5-15 FPS loss is expected.
- If you did not read the above sentence please read it now >

Overall/Recommendation:
The 3/16'' sorbo pad does not reduce noise volume as most people may have wished, but it DOES lower frequency a bit which is just as good if not better.
Durability increase isn't a big factor for sniper rifles, even with a stock plastic piston. However, if you're afraid of breaking your piston in half for whatever reason, the sorbo pad will help.
Accuracy will increase very slightly due to vibration reduction, but also due to the FPS loss mentioned earlier.
I recommend the sorbo pad for those who want the quietest rifle possible and don't mind the FPS loss. There are literally no downsides besides the loss in power.
Once again, most people may be expecting this sorbo pad to be an ultimate silencing product, but it's very far from that.
If you're trying to squeeze every last ounce of performance from your rifle, then this is something to consider.