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Shark Hopup Bucking was originally designed for 470 to prevent double feeding.
By having 3 special "fins" inside the bucking, Shark Hopup Bucking can hold one and only one B.B. tightly in the chamber.
In the mean time, to our surprise, we found that this bucking could enhance the velocity on some AEGs.
But not all AEGs will have the same results and the result could be different from one AEG to another.
Unfortunately, we don't know the exact reason because each AEG has its own characteristics.
However, we do believe that the friction (from 3 fins) applied onto B.B. will enhance the velocity.

Gear and Pistol Lubricant in one package.

WORLD FIRST (maybe the only)7075 AIRCRAFT ALLOY AIRSOFT BARREL. 6.01MM PRECISION TIGHTBORE. HARD ANODIZED COATING. TITANIUM COLOR FINISH. ULTIMATE TENSILE STRENGTH & HARDNESS

The Madbull Standard Cylinder Set has all the necessary parts to upgrade or replace the cylinder assembly in your gearbox. The Cylinder Set includes a cylinder head, air seal nozzle, Madbull Alien green PX piston, the cylinder, and a polycarbonate mushroom piston head w/ bearings. The Cylinder set is compatible with most major brands of AEG. Take your standard gearbox to the next level of performance with the Madbull upgraded cylinder set. It is a must have for a high quality build.

After 6 months try and error, we finally made the most "colorful" spring which is more beautiful than anyone else. (So does the performance)
(The color is not painted. It is hard-coated by special process.)
Calculated carefully by computer and test by 100000 times punching.
Our spring has been proofed that the length and force are still consistent.