MadBull Sniper Accelerator Hopup Bucking for VSR10 / M28 Series Airsoft Sniper Rifles

"This is a very good bucking. Though the design is awkward without instruction, it works well. The short bucking design must be wrapped with teflon tape. The tape seals around just before the window of the barrel providing great pressure without the extra space. I like how madbull kept their eye on detail.
I used this with an aeg prommy barrel and i am only getting +/- 4 fps. The design is easy to shave off excess parts of the bucking.

Yadda yadda yadda. It's good, just seal it with teflon and you're golden.

"Works amazing in my Bar-10 G spec. Amazing air seal!

"Got this for my Echo1 m28 and it worked great! I could notice the fps increase and I'm not 100% sure how much better the groupings are but my gun was already accurate so I wasn't sure how much of a boost it was to that category. Also cool that it came with 2! Only major problem that it has is that it didn't stop my double feeding :(. But I can work around it.

Pros:
Cheap
Comes with 2
Air seal
Accuracy

Cons:
Didn't fix double feeding

"Gentlemen,
I'm sorting with only 1 point because this Bucking is shorter than the original, and I lost 50 FPS in my M28, just with mounting the same, so after several assembly and disassembly, it was the best resutado, returned to the original and Bucking regained the lost FPS, I'd love to put a better bucking, but this does not return to my gun.