some feed back 2 years later.
Something finally broke! The mag release broke right in 1/2 on the inside of the grip and I can't find the other 1/2 so this gun may finally be toast. 1 of the mags developed a slow leak but I never fixed it as it still lasts for a day of gaming.
I also discovered a way the thread the other barrel,
http://shop.ehobbyasia.com/pro-arms-...-14mm-ccw.html
take off the slide and cut away the outer barrel until you reveal about a 1/2 inch of the inner barrel. It's super easy to attached and adjust then put the slide back on...just like that a threaded outer barrel.