I never saw one advertised back when I started building rifles on the Mini action, so I bought some 6061 T6 aluminum tube & white delrin rod, and a brass bolt, set stuff up in the 3-jaw on my lathe, and turned one out for myself. More or less copied the commercial ones I've seen for Rem 700 actions, just scaled-down to fit the smaller Howa Mini. That was several years ago - I'd have thought someone like Possum Hollow would've started making something for them by now??