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What about buying one of the BX-1-1 mags from Ruger? Some say they're pointless, but it won't accept more than 1 round, and will be cheaper than any "drop-in" conversion.
The JG Bolt Lock that JFB references would work, but they're apparently some $70. See a review HERE. You can contact the manufacturer at the link at the bottom of that page.
The JG Bolt Lock that JFB references would work, but they're apparently some $70. See a review HERE. You can contact the manufacturer at the link at the bottom of that page.