The P7M7's hydrolic buffer system was never proven sucessfully reliable for production. Also HK estimated that production costs were WAY too high to justify further developement for production....And while we are at this .45 caliber wishing well: why not put the P7M7 into production ?
That would (at least in my opinion) be a more desireable (and possibly more effective/accurate) CCW pistol. It has already been R&D'd, built and proven.
And I would buy one of those too.