What is it? It's purpose? What platforms can be used. TIA

One of the many wildcats made to comply within the Indiana "pistol caliber rifle" regulation(s).

I believe his original was based on the WSSM at 1.625 case length, seem to think he made a 1.8" version or at least talked about doing it when the regulation opened up for longer case length.

I don't think he was selling them, but may be trying to unload his personal items now as the DNR proposal may open up practically any centerfire 6mm + in 2015.

Just a bolt action then?

I did my variation on Encores, bolt rifles, AR-15 for 1.625" WSM and AR-10 for the 1.8" WSM.