This is a stand designed for a Ruger mark iv. It may also work with previous version mark i-iii but this is untested. V1 (pictured) and V3 are mostly the same just v3 has the R in the logo and the pegs the stop the gun from sliding all the way down are a little higher. The STL file is only there because apparently thingiverse doesn't recognize 3mf as a 3d file format. You can use either.