Easy way to check if it's the mag casts is to clean a spot up on the inside and put a drop of vinegar on. It'll fizz if it's magnesium, Alu and pot metal doesn't do this.
Since you have a GR300 kicking about put a solid stock on it for a laugh. I guarantee that the weight and feel of it will make you think about using one on it.
Since you have a GR300 kicking about put a solid stock on it for a laugh. I guarantee that the weight and feel of it will make you think about using one on it.
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