The Mad Bull Shark bucking and Fishbone X Balancer were originally developed for the Mad Bull 470 CO2 powered drop in mechbox to prevent double feeding of BBs and to prevent BBs from rolling out of the barrel. By having 3 special "fins" inside the bucking, the Shark Hop-up 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. 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 increase and slightly build up the pressure behind the BB before it starts traveling down the barrel thus enhancing the velocity much like a blow gun, spit balls with a straw or similar concepts.  The Fishbone X Balancer is designed to produce and even downward pressure across a greater surface area of the BB in order to lessen the chance of off axis back spin being induced from the hop up system. The Mad Bull 60° Bucking With Nub is an upgrade over stock 80°-90° buckings. Why 60°? 60° rubber is softer than normal 80°-90° rubber. The softer rubber tends to create a good air seal with the nozzle. Softer rubber provides higher friction/grip and makes the hop up effect more pronounced with less velocity loss associated with typical hop up systems where the hard bucking must be pressed deep and hard into the hop up relief cut on the barrel. This causes dramatic reduction in speed. This 2 pack includes 2 buckings and 2 nubs.

• Includes 2x 60° AEG Shark Fin Enhanced Rubber Buckings 
• Includes 2x AEG Contoured Nubs

Upgrades may require expert installation. Damages resulting from incorrect installation will not be covered under the manufacturers warranty.

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