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Understood, thanks for the info guys!

No, it's 16 inches and I want longer.

Can I? From this very website, regarding DPMS and Armalite compatibility: The bolt carriers are interchangeable if used as a complete unit. You cannot interchange the bolts by themselves.

I can. But I feel like something so simple, a black 18 inch barrel in Armalite pattern, should be easy to find. But yes, I'll be painting one if I have no other choice. I just want to make sure I have no other choice.

Hi guys, brand new owner of a brand new Armalite AR-10A4. I'm looking for an 18 inch barrel in black. I've looked and I don't understand why it's so hard to find. Whenever I find one, it's either DPMS pattern or something flashy like stainless or chrome, which I don't want. I found maybe 1 or 2 that fit the bill and wouldn't you know it... they were sold out! Anybody know where I can find one? Any and all help is appreciated. Thanks!