This bolt was one of my favorites for the price. (ebay-$20 shipped)
Very smooth and very fast with my E1. Only thing bad is the made kick I would get out of it. Other then the kick, I have great air flow over the ball. Big and heavy pull pin but I used a derlin pull pin for it. I usally bring it with me in my gear bag to let other cocker players check it out.
Great bolt for the price. Back heavy but great flow. One of my favorites
Quick question. What kind of gauge are you using to measure recoil, air patterns and cycle rates? Let me guess you didn't sit down in a lab under ideal conditions and test the before and after and take into account all of the varibles involved, right? So pretty much you sat down and decided to pull a bunch of hype and hear-say out of your @$$ and tried to get people to believe this? Delete this because its garbage.