Question about AR pistol barrels

[nick]

Hi,

So, I got a couple of AR pistol barrels here: http://www.calguns.net/calgunforum/s...d.php?t=484038

I just received them and I'm curious what they are. The bottom barrel is completely unmarked, the top one has '164' stamped on it. Any info is appreciated.

[bohoki]

they look like they were from the carbon-15 pistol

[Milspec714]

[nick]

Sure does look like it. Thank you, guys!