UL Framed pm6
Hybrid bolt guide
-None that I found so far
Only used it once so far and shot 3 cases with it. All I can say is wow, no kick whatsoever. My eyes were not working on my proto this say soo I play with eyes off all day, not one chop! Im very pleased with this bolt. Another thing that I noticed was that it was amazingly light, alot lighter then the stock bolt. And not too mention carbon fiber is just soo cool. If you have the cash lying around then definatly pick this up!
I would highly recommend this bolt. Its fairly cheap($100cad) compared too other Proto upgrades.