Hey, I just purchased one of the new Tokyo Marui M4s and it is very nice.
it has a one peice outer barrel already, it came with it and where is the screw you are talking about located?
The screw he is refering to I believe refers to the two-peice barrel.
hmmmm this seems feasible
crfsean is right. That solves 90% of the barrel wobble. The last 10 percent is solved by the metal body.