I can't answer that question, but I can tell you they will work in the Winchester Defender 1300 without modifications. I have a Defender on bedside duty and another 1300 I am going to cut down if I ever get around to it. Aside from minishell capability, they have the slickest action of any pump I've seen.
Not sure how OP gets a Shockwave in California unless he means the 18 inch version. If that is what you have in mind, get a Defender and put a bird's head grip on it. I would much rather go with a design that's been proven over 60+ years than a brand new bullpup that is already reporting problems.
Not sure how OP gets a Shockwave in California unless he means the 18 inch version. If that is what you have in mind, get a Defender and put a bird's head grip on it. I would much rather go with a design that's been proven over 60+ years than a brand new bullpup that is already reporting problems.

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