I initially ordered the barrel assembly from Sarco, but at the time they were backorderd. They have them now. I found mine at a gunshow. Think I paid $150 for it. It's made by Colt. I pretty much scoured the show and got a lot of the misc parts like gas tube, delta ring, barrel nut and bolt/carrier.
To the discerning eye, it's not a true A1 clone. A1's didn't have a shell deflector or delta ring. If anyone knows where I can find a correct ring, I'd love to get one. Also, the mag isn't correct, but I do have straight 20 rounders for it and a NOS nylon sling.
Lump