Factory Ruger Mark Pistol Case.
This is the case that a 10″ Mark IV ships in.
They were removed from parted out Pistols.Will accept BOTH 22/45 and Standard FramesTape measure in different pics for dimensions

With a small amount of cutting you can get a 12″ barrel in it,,
WHY would that be a concern?
Well, ya just NEVER know what may show up here!