I had a HK94, (A3 actualy, teloscoping stock, with foregrip and barrel shroud) I sold it back in 97 for an astronomical $3000.00…
I don't miss it a bit. Whenever I think I'm getting wistful for one, I realize I'm really just wistful over not being rich eoungh to afford one. A 16" bbl AR type actualy weighs less for 1/2 to 1/3rd the price, and is much more potent with .223 vs. 9mm, for the price of the HK you could buy a 9mm upper for that AR that takes cheaper UZI or Sten magazines, and still have plenty of money left over.
It's only claim to fame is the "HK mystique". It'll launch 30 9mm bullets as fast as you can pull the trigger. It's nothing that a $200 Hi-point, or a $350 Kel-Tec Sub 2000 won't do for a fraction of the price. The HK would be tougher or more reliable, but it's not $1500+ more reliable, IMO.