I might be able to find out. I do have a Quantico 2112 built rifle, but don't have the full set of 0.001" incremental gages. Whether my informed contacts have the info locked in their brainpans, I don't know. But, it seems that they weren't anything special, IIRC. There also have been some rifles built by subcontractors in small numbers during the M40a3 development phases.
The case neck diameter issue mentioned above is of more than academic interest, as well. There are chambering reamers that are in line with the old 30-06 diameter specs which are used not infrequently by some competition shooters on the high power circuits. Loose enough to be safe and reliable with semi-autos, but providing better case alignment and far less case neck expansion.