Where to find a 20in pencil barrel, as in an m16a1 barrel?

[mutt]

I've gotten the urge to build an m16a1 clone. Seems APEX Gun Parts has most of the period correct pieces minus the barrel. Anyone know where I could find a parkerized 20in pencil barrel? I'd prefer a Colt barrel but I'd settle for a decent quality barrel from another manufacturer. Twist rate doesn't matter either. While a 1/12 would be correct it's not a deal breaker if it's 1/7 or 1/9. I'm going for looks more than technical correctness. Not like it's going to have a proper Colt lower any ways.

Or does someone know where I could buy a surplus m16a1 upper? Prefer one with the tear drop forward assist.

[Great-Kazoo]

Whistler has / had one listed in the firearms for sale forum. 1:12 20 pencil bbl on an A1 receiver. A1 front sight,

[Rabid]

BCM 1:7
http://www.bravocompanyusa.com/BCM-20-Rifle-Length-Barrel-Stripped-p/bcm-brl-s-20%20std.htm

ETA: used parts kit
http://www.sportsmansguide.com/net/cb/cb.aspx?a=1143546&cjaffsite=adrian+laza&utm_medium=CJ&CJ=1&cjaffilid=4084797&utm_campaign=Redirect-Enabled+Deep+Link&utm_source=adrian+laza&cjadvid=1522857&cjadv=CJTSGUSA

[mutt]

The BCM barrel is an A2/Govt profile, not A1. A2 profile barrels are easy to find. A1, not so much. As for the other upper parts, APEX has parts in much better condition.

[Rabid]

Thanks for the education, i did not know that.

[earplug]

Mckay international. I just ordered one.