I own one of these and just got it down.
the orange flash hider is horrid. i actually took a hack saw and cut around the edges where it sits flush with the outer barrel. i hacked around in a circle until it loosenned the glue. there is actually an orange cap which is the flash hider part glued over an orange threaded cylinder. once the cap fell of the orange cylinder was exposed and i simply used pliers to turn it (completely demolishing the threads, but im pretty sure they glued the threads in so it had to be done
) after that its not reusable but who cares, it was worth it to solve this next issue...
I have found that the bucking ( i think thats what its called. The rubber small tube that helps push down the hop. I think ive heard it called nubbin) is too big... or the hop up is being pushed down to much by shotty craftsmanship... which ever...
I removed the bucking, and instead cut strips of thin rubber (from an old hop up unit). I placed the small square pieces over the hopup where the bucking usually goes. two layers worked perfectly for me, and it shoots straight.
The adjustment mech for this hop up is useless!