I'm in the same boat as you. I ordered a LW 16" CL, eternal BO, I switched to a CL M4 which is now out of stock. I told Pam at Del-Ton just yesterday after she called to make it a CM 14.5 and pin the 5C2 flash hider. They do have CL carbine HB and Mid-length HB in stock if it'll fill your need.
Order date 12/17/08 order 278xx.