I haven't heard anything about Tim LeGendre for about 4 years. Last I read in a publication was the 2000 GUNS annual, where they featured the M1 carbine conversions in .45WinMag and .50AE, his .45 caliber AR15 45/70 workalike, and a scary Garand/BAR hybrid in .338WM.
I have never seen/found a contact number or address for him, but I suppose you could contact the archivist at Guns Magazine and see if they have anything. IIRC he's in the Flint, MI. area.
I do know he had stock breakage problems with the carbine; usually after about 7 shots the wrist would come apart. He used a Choate stock on all his later M1 carbines that fixed this problem. Also, the short-piston models of his carbines are much harder recoiling than his long-piston models.
Me, I'd rather have an AR in .50 Beowulf or .458 SOCOM.
Regards,
Rabbit.