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I have purchased two of these to install in my guns and both of them are bulletproof. I have 6 ICS M4’s and all are running Madbull 130 springs with silent piston and cylinder heads. I have had the pistons for about 6 months and have run about 20,000 rounds through them with only one issue. The issue is that these pistons are very heavy compared to a poly piston (In my opinion). Both of my ICS upper gear boxes cracked in the front due to the 130 spring pushing the heavy piston into it. Even running silent piston and cylinder heads did not stop the cracking. You would think that there would be some sort of shock absorption using this set-up, but apparently not enough. These pistons will be great for stock springs but I don’t recommend them for anything above unless you “Swiss cheese” them to reduce the weight. That is what I have done to remedy the issue but I haven’t had them in there that long to tell just yet. Being aluminum, they handled the drilling very nicely. Just be sure to de-burr ALL of your holes afterward. If my new gearboxes last 20,000 rounds I will purchase six of these and drill them all. Had to give them 5 stars as the pistons themselves are virtually indestructible.
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Submited By: Piotr S.
