I've had both the HK mount and a couple of ARMS flat top mounts. Unless you like the German idea of where the scope should go and like your head high, and to the rear, I'd seriously consider the ARMS mount. Same on/off/on zero holding capabilities, at about half the price. Its also a lot more versatile, and you can mount things other than a scope.
skeeter,
I've got a brand new genuine HK claw mount with inserts, scope mount, that I would part with. This is a genuine HK mount, not milsurp, or whatever. If interested, PM me and we'll discuss it.