UPDATE: 10.23.2007: HKPRO.COM has obtained a copy of the BKA document approving the MR223 and MR308 rifles for civilian consumption inside Germany. What is important to remember is that this document is specific to Germany only, and lists low capacity magazines, presumably for compliance with German law. Also listed are several barrel lengths that are common with the HK416 and HK417.That means the HK 416/417 may eventually find their way into American consumer hands. In truth, I haven't shot one; I've handled Bill Murphy's, and he's really high on it.
As far as U.S. consumers are concerned, they should not make certain assumptions. First of all, these rifles as submitted have NOT been submitted to American regulatory authorities as of this writing, and the specifications are subject to change at any time.
There is no doubt that the HK gas pistons guns would quickly become big sellers (no doubt at a tidy price tag, too). Unless HK moves relatively quickly — not something the German company is noted for — they may miss the curve. I've shot the LWRC and the Sig 556 piston guns; DS Arms Gas Trap and Bushmaster's gas piston guns are coming into the market. POF is pretty well established, and even the Masada is looking for like a real gun that vaporware. Should be interesting!
Another data point — Some of the issues on the Ruger SR9 trigger seem to stem from people dry-firing the gun and/or weighing the trigger pull with the magazine out (which the Ruger manual specifically says is a no-no). Walt Rauch bought this to my attention last night; he'd emailed Ruger and asked about the trigger, and they responded by asking how he'd measured the trigger. When Walt inserted the magazine and reweighed the trigger, it broke at 6.25 pounds.
I just got an email routed from a dealer talking about the very same thing, so I thought I should post this. The SR9 should ONLY be dry-fired — and that includes weighing the trigger pull — with the magazine inserted! Thanks to Walt for checking with Ruger and clearing that up!