I have one, like it, but as someone else said, no parts are available.
The best site I know for info on commercial carbines is
M1carbineInc.com

I bought my Erma from the site owner and sold him a S&H M1 Carbine.
Great guy, don't hesitate to contact him.
BTW: He has cautioned me about field-stripping beyond stock removal for cleaning. Easy to get into trouble.