I just got this bucking today for my BAR 10 along with a pack of Mad Bull .25s. I had bought this instead of the Firefly bucking because I've heard that the firefly requires modding to work right. Today, I got home from Lego Robotics (It's a legit sport, believe it or not!), found the package, opened it up and took a good look at the bucking.
The bucking is colored red, and pretty hard. I then installed it in my gun. I loaded a few BBs, aimed at my BB trap and fired, but nothing came out the barrel. When I pulled the bolt back, I heard a "pop" sound from the air being released, and I felt small breeze come from the magwell. When they said "Air-Seal." they weren't lying! After a few minutes, I thought of how to fix this problem. I first loaded one BB, and just kept cocking it and firing it. After a few tries, the BB finally came out of the barrel, at a pretty high speed (I'm guessing around 470 with .2s).
Conclusion: This bucking is great, and it fits in your VSR/TM pistol right out of the packaging. However, you have to break it in first.
Pros:
Accuracy improved
FPS improved
Great Air Seal; I didn't even need to teflon mod it!
Range Improved
Cons:
Requires "Break In"
Somewhat hard to get on the end of the barrel
Makes the gun louder
