- Make sure this fits by entering your model number.
- Stainless steel construction
- 20 piece shim set (4 sizes, 5 of each size)
- Precise machining allows for extremely accurate gear adjustments
Hop up rubber bucking 60-degree Blue 2pc Made in Taiwan This Mad Bull Thunder Series 60? rubber hop-up bucking set is designed for regular AEG maintenance. Keep your gun in firing shape and pick up this rubber hop-up bucking set today! How to install: Apply some silicone oil inside and outside the bucking when installing onto the barrel and into hop up chamber.