A designer has opened public testing of a printable adapter that mounts a red-dot sight to a KelTec P17 on a Picatinny rail. The files currently cover RMR, RMS, and DPP patterns, with more to be added later.

Anyone who fabricates the part should report which pattern they used and how well it fit. Twitter messages reach the designer more reliably than comments on the original listing. Users are directed to the included documentation.