Free? Yes Free! The catch this is just the digital file you will need a 3D printer or a friend with one. I do have a few requests. 
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This is a Magazine Block designed to fit a Howa Mini Action. This goes in, in place of a magazine preventing the bolt from being closed. Typically print in a bright color as a visual indicator the weapon is safe.
 
Don't have access to a 3d Printer buy the physical item here.