RMR HOLOSUN Picatinny mount PS9022
thingiverse
Standard PS90s have a different sight component than the Hightower Armory Ruger 10/22 to PS90S/22 conversion kit. If you want to add a sight to the PS90/22, you have to use the picatinny rail that it comes with. I wanted to use an RMR red dot, so I modified this GO PRO picatinny rail mount bottom: Thingiverse: 103878 With this RMR / Holosun 507C as a top: https://www.thingiverse.com/thing:4699964 It seems to work ok. There are Holosun models designed with a picatinny mount bottom, but I got one with an RMR bottom on a good sale.
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