your only option is a bored M4 devastator tube (unless u'd consider other bored bodies with extensions - bored too). Not many of those around these days.
I'm selling a Fivemega 2x18650 M Head C Tail host bought earlier from
http://www.candlepowerforums.com/vb/showthread.php?t=248230
Totally unused (except for testing for head, tail and battery fit - works with AW 2600mAH cells). *Tailcap not included.
$70 shipped to anywhere
Will pm my paypal...
Got my tailstand today... but my tail cap retainer isnt budging... boiled it for a couple of minutes and all i have are scratches on the anodizing.....