Rowan-Becker started about 1956 making carbines. They used about 1000 receivers they got from National Ordnance. (four years later National Ordnance started making their own carbines.) Cast receivers were also made in Ohio for them and later in Detroit. At one point they also supplied an unknown amount of receivers to National Ordnance. In 1961 they wholesaled a unknown amount of carbines to Sear. Rowan-Becker went out of business in 1963. Some Rowan-Becker receivers were believed to have been made with scrap welded receivers and this fits in with what National Ordnance did and may be were these welded receivers came from.
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