early 1980's, had an article about the semi's based on the M14icon action.

These were made at the Springfield Armory, without the leg for the full auto parts and
dismounted the OP-rod using the M1 Garand system.

The Gas cylinder didnot use the cut-off spindle, just a thru hole for gas feed.

I think 30(?) were made for testing, but were determined as to be:

1) not a standard rifle (per M14)

2) the ATF stood fast on "Designed as a class III, always a class III"

3) DOD determine that diversion of part and second line was deterimental to
manufacturing of the M14.