I`ve got one I bought a few years ago ( gunshow find ) ...mine has the brass reciever and sheet brass forearm 50 cal ... these rifles were called EathanAllen Rifles , sold by Mowrey in Olin TX. USA ...Mowrey has been out of business for quite a long time , but a company called DeerCreek ..bought the gunworks and parts ...The folks at DeerCreek have plenty of parts on hand and can make just about any part you could need lock stock and barrels .....I replaced the brass reciever on mine with a steel one from DeerCreek ...they still make the brass but also offer it in steel ....I had problems with the brass reciever getting soft so I replaced mine with the steel reciever and kept the brass one for latter replacement ...
The folks at DeerCreek told me the brass reciever model was rare around 1959 - 1960, not many made , they had never seen one , just talked to people like me that owned them . Here`s a pic of mine with the reciever replacement