Honestly, foam always made more sense to me than a hollow stock. First, it gave the plastic stock back-support, making it less susceptible to cracking if it was hit, and then, if it did crack, it would not fill up with water and sink, like a hollow one would.

I don't know when mine was made, but it was a Charter, and I bought it in the early 80s - '81 or 2. Pretty sure it was used. Do remember it was 75 dollars.

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I always take precautions