The Plainfield was considered one of the better commercial M-1 Carbine clones.
Plainfield Machine Corp, produced M-1 Carbines from 1960 to 1977, when they were bought out by Iver Johnson Corp, who manufactured them at least until 1993.
The early ones were made using surplus GI parts on a cast receiver they made themselves.
The rear sight was a very cheap copy of the later GI adjustable M-1 Carbine rear sight.
A GI sight is what I would put back on it if you can locate one that doesn't break the bank.
BTW: A lot of Plainfields lost their rear sights. They were pretty crappy to start with, so no big loss.
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