A&K or Classic Army M249 full length outer barrel, dont know where to order one

[Tommygun_ted]

I'm not sure if I'm posting this in the right place or not, but go easy on me, I'm on my iPod and don't feel like wasting 3 years looking for someplace that seems more fitting. Anyways, I want to get the full length outer barrel for my M249, its the para one, and has the shortened outer barrel. it shoots around 400 fps, so I'm not going to be using it for cqb, so why not have that extra barrel length? I don't know where to look tho to order one, I've checked all the parts sites I know, but can't find anything. Are there any retailers who sell classic army or a&k parts that anyone could refer? Or any sites where I could order one from? I'd look it up myself, but with my work schedule and all the people in my house, I never get on the computer, and my iPod is just so slow. Any help would be greatly appreciated, thanks.