If Rohrbaugh wants to stay true to the concept of the smallest, lightest major caliber pistol in the world, going to a .45 seems an anomoly, unless the thought then becomes producing the smallest, lightest .45 in the world. But to keep it small (as in true pocket pistol), I wonder what the mag capacity would be--4+1? For me anyway, if I want to carry a .45, I strap on my Kimber Stainless Pro Carry II Ultra (7+1), which is about as small and light as I personally want to handle with the .45 recoil. And there is a limit to how small and slim one can craft a .40 or .45, notwithstanding the use of wondermetals like titanium or scandium. I bought my R9S because it weighs almost nothing--demonstrably lighter than my guardian in .380. A pocket pistol should not pull your trousers down on the carry side. I can see maybe .357 Sig, but anything larger would turn the gun into something other than what is was envisioned to be.