Hubbell Plastics
The boat paddles were done by an outfit called Hubbell Plastics, using Zytel, From "Ruger and His Guns", engineer Jay Jarvis comments that the butt scallop and forearm inserts was a way to reduce bulk without requiring a complex mold core which would be more expensive.
The inserts cover holes in the stock left by the simple mold design. The solid thin butt yields strength w/o bulk via the same simple mold concept. (my translation)
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