It is not known exactly when Charles Colle initially contacted or contracted Plainfield Machine for work on M1 Carbine receivers and barrels.
Between 19 they were contracted by various different companies for all types of machining.
Millville Ordnance advertisements in Shooting Times magazine in 1960 and until October 1961 advertised various parts that included parts for the U. Carbines including commercial .30 caliber carbine barrels referred to as "the all new MOCO barrels".
The later ads during this time period announced an upcoming all new MOCO carbine.
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Vinyl is definitely experiencing a revival with demand growing stronger year on year.