I thought there was a longer one than the one we're using out already (I didn't get it because I personally like the silencer...although it sucks that a quick detach thing becomes a permanent feature on the gun, but oh well).
I'm not sure why it says 18", although it's probably the total space for an inner barrel.
Anyway,
HERE it is.
Sorry deadly, and the rest of you guys; but why would you need something longer than this? Why would anyone want a 500mm+ inner on a SCAR? And at 60 bucks :/? I don't think it was the greatest idea.
Fox.