This is the stock piston in the Echo 1 Platinum edition M4 and many other VFC guns. Unless your running a stock setup and just need a new piston, I would not recommend this. This piston is a little weak for any gun running over 350-360 fps or any gun with a extremely high ROF. I would definitely recommend looking into other upgraded pistons before spending your money on this. Although it is lightweight, the durability is lacking. Within one month my M4 with a 9.6v battery had ripped this to shreds. I went with a upgraded Bravo piston and it had held strong for almost a year now running a 11.1v Li-Po battery. Just spend a few extra dollars and get something that will last, because a stripped piston can easily lead to other broken or stripped teeth on your gear set.
Good for a stock gun without any spring/high speed upgrades
Not suitable for high rate of fire
Not suitable for stronger springs
The last metal tooth has no reinforcement, and I have seen 2 cases where not the tooth, but the metal plate has broke and let the last tooth drop making the last tooth before the piston fires the next plastic tooth. (if that makes sense) Ultimately, this will cause you to strip each and every plastic tooth until the gun will not fire at all.
Rating: [3 of 5 Stars!]