SHS Ball Bearing Aluminum Piston Head

I bought this piston head for my L85 DMR Set up. At first i thought it was another aluminum piston head, but the Compression Between it and the stock cylinder head is So good, im only getting a +/- 3 FPS Variance. Something that usally takes piston heads of Higher prices. All i can say is once you Go Shooter, You'll never go back. The Quality is Supreme and Much MUCH MUCH better then anything else in its price range.