Strategypage.com makes a muzzy post on the current Joint Combat Pistol program, including the claim that it is slated to replace the Beretta M9 for the DoD, and the odd statement that it will need to "have a rail up top".
Enthusiastically riffing off this bad info, respected gun nut Kim du Toit opines that they need to pick the 1911, ignoring the DA/SA requirement in the spec sheet. He even goes on at length about the "rail on top" requirement (which doesn't exist anywhere outside the Strategypage blurb.) Hell In A Handbasket and SayUncle, both stand-up guys and rabid gun enthusiasts, also take the "Replacing the Beretta" ball and run with it.
The pistol will replace the M9, but only for SOCOM. My money is currently with the USP45, whose dimensions, as it has been pointed out, are suspiciously similar to the max dimensions given in the RFP. With the company having spent a wad on a plant in Georgia, only to flush a ton of money down the failed OICW and XM8 programs, they are due to be thrown a bone by the DoD. (Throw in the G11 flop and the less-than-succesful SA-80 revamp, and HK is turning into a lederhosen-wearing version of Colt: A company with a positive gift for bad luck.)
Incidentally, the size of the proposed contract, at 645,000 pistols, should give a good idea of just how really amazingly bloatedly huge SOCOM has grown in the post-Transformation military. Heck, I think our local Cub Scout troop is attached to SOCOM. Kinda takes the "Special" right outta "Special Operations Command".