This mount is ideal for installing FMP13 on a Picatinny rail platform where a low optical height is required.
Yes. On a rifle or shotgun without a scope, the PM05 lets the FMP13 work as your main sight, mounted low on the Picatinny rail. That works well for close-range night work on hogs where you want both eyes open and a quick picture.
Zero it close. The FMP13 is a short-range thermal, so a 25 or 50 yard zero matches how you'll use it. Low mounts put the sight near the bore, which keeps the gap between point of aim and impact small at those ranges.