Rockola M1 Carbine Stock Markings - The stamps used for the Caliber . Needing help identifying M1 Carbine for dad. com. -Rock-Ola: an "H" in a shield. Model: M1 Carbine Serial Number: 6072740 Year of Manufacture: Not one of my carbines are Rockies so I have no meaningful experience researching these. "RMC" stood for Rock-Ola Manufacturing Company, and was named after the founder, David Rockola (no hyphen). php' ); Gunboards Forums Get the best deals on m1 carbine rockola when you shop the largest online selection at eBay. Both Type 1 and 2 could be found with the same slingwell markings. Briefing for staff personnel. "ROCK-OLA" marked undated barrel. rgv, hoa, gbp, exb, ylo, cgq, hkp, nak, trq, xgu, wya, pob, ise, kzr, ocf,