I am hoping that the collective knowledge here can educate me.

I've seen literature that states Irwin-Pedersen carbines only used deep groove handguards.
Also a couple of sources that state S'G' only used shallow groove handguards.

What about the carbines assembled by S'G' from Irwin-Pedersen parts? Like the 3,2xx,xxx mixture of S'G' and Irwin-Pedersen carbines? Did it change from month to month as existing handguards were used?

Is it correct that IR-IP handguards come in deep and shallow groove.

Lots of questions, I know.

Thanks everyone. I really appreciate the guidance and transfer of knowledge!
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