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MadBull 60 Degree Shark Bucking With Fishbone Spacer (Color: Red / Design: Hard)

ID: 28917 (BU-MB-HB-RED)
MadBull 60 Degree Shark Bucking With Fishbone Spacer (Color: Red / Design: Hard)
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$12.00 $10.80

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The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.


  • Three fin design reduces double feeding as well as improves hop up contact
  • Improves compression and in turn a possible FPS increase
  • Specifically designed for AEGs shooting 350 or higher FPS
  • Fishbone style spacers improve contact over standard spacer design

The Shark Hopup Bucking from MadBull was originally designed to prevent double feeding by incorporating 3 fins inside the bucking to aid in securing the BB. The design also improves compression which in turn improves both consistency and in some cases FPS. The 3 fin design paired with the "Fishbone" style spacer also improves the surface area which contacts the BB. This in turn improves both consistency as well as the range of hop up adjustability. The red bucking is specifically designed for AEGs shooting 350 or more feet per second.

Material: Rubber
Compatibility: 350 FPS and higher
Package Includes: Two buckings, two Fishbone spacers

About Madbull

MAD BULL Airsoft, established in 2004, is world famous for it's Airsoft accessories. Our major focus points are: Airsoft guns, Airsoft Toy Launchers, Airsoft Toy B.B. Showers, and Upgrade kits.We have a very strong R&D team and we put a lot of effort in designing new and exciting new products for the airsoft community.

46 Customer Reviews

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by Noah B. on 07/28/2023
"Amazing bucking for Polarstar Jack. It fixed issues I was having with feeding and accuracy. The teeth in the bucking held stabilize the bbs right before it gets launched down the barrel. I am using a Prometheus eg 6.03 tightbore and Madbull Ultimate Hopup. Only issue I ran into was the the length of the bucking. The bucking was interfering with the barrel clip, so I had to trim the end of the bucking. However, this is very simple to do and does not affect the performance. If you run a Polarstar Jack or any other open bolt system, I would 100% recommend this bucking. (Bought the 60 degree red).
by Auston C. on 06/13/2023
"Works well in my matrix metal AK hop up. Had to do a little cutting to make a compete seal but nothing major.
by Quintin A. on 10/05/2021
"Works great for my Echo-1 P90! No issues so far.
(I have Prometheus 6.03 EG Tight Bore Inner Barrel for Airsoft AEG (Length: 247mm) and Angel Custom Advanced THOR Complete Hopup Chamber for P90 Series Airsoft AEG Rifles)

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