Forgive the Necro, but it's relevant.
So I had received my TM FiveseveN on the 11th of March, and loved it to death. I was in the middle of a pistol/shotgun cqb only event tonight, about two hours ago to be exact. I sighted in on a target, gently pulled the trigger, and bam, my outer barrel just popped out the front of my gun.
Sure enough, I field stripped it and the outer barrel had shredded itself off of the hopup unit. Exactly what I feared when I had bought the gun. Less than two months of average careful use. Naturally I had my gun cleaned and maintained regularly so that wasn't the issue, I guess I just faced the inevitable for running green gas through it.
Lucky for me, red wolf airsoft seems to carry some outer barrels for the 5-7 by Nine Ball for around $25. I must say though, despite this little setback tonight, I'm very proud of my 5.7, it's the best airsoft handgun i'd shot, and within those two months, that beast saw a total of over 250 kills. (I'd often play pistol only) So until I can scrounge up $25 I bid my pistol farewell.

<< The cracked outer barrel.