The only Oly receiver that was cast was their economy one - the 'plinker' IIRC. I have one built in '84 that still runs just fine, after thousands of rounds.
People forget that Oly was one of the first to make an AR with a rail on the receiver - long before anyone had ever head the word 'Picatinny'.
People forget that Oly was one of the first to make an AR with a rail on the receiver - long before anyone had ever head the word 'Picatinny'.