That letter is either a "G" or an "L" (there is debate even among the admin here...LC thinks G, I lean towards L). The Chinese had odd looking Latin lettering with additional tails in many of the carbines of the '59 to '60 timeframe. (C, D, G/L, P, T etc.)
We would need a full spread including a clear photo of the import mark to make an estimate on whether it's an IC or not. It's highly unusual that the phenolic furniture would have been on that carbine at time of import, but it could have been. Again, photos will tell the story, post them and you'll get some knowledgable members to chime in.