Lol - 1911's being reliable out of the box. I've owned 5 so far, all have taken a dump. I'm on my second full frame USP in 45, neither of which have hitched. My personal bias is obvious.
Anyway -
Basically, the selector on the standard HK USP is set up to be safe (up) semi (middle) decock (push all the way down). The weapon can be carried *safely* cocked & locked *or* hammer down. The selector 'mod' is pretty easy to do. I did mine myself - the only part you need is 6 or 7$. You basically change out a plate right above the selector lever which changes its behavior. I have mine set as a variant 9, which behaves just like a 1911.
You can read more about the weapon here :
www.hkpro.com/usp.htm12 round mags are now readily available - I have been finding them (with a little looking) for around 40$/ea. That's actually 5$ less than dealer cost, so be prepared for it.
The 9mm version can hold 18 rounds, the .40 can hold 16, with a jet funnel. I think factory, they will hold 15 and 13, respectively.
The USP is the pinnicle of refinement on the john browning design, IMO. There is no weak cam point (barrel link), there is no fouling point on lock up (slots on top of 1911 barrel), and since it is a polymer frame, little lubrication is neccessary for consistant function. The full size weapons incorporate a double recoil spring which takes *all* of the bite out of the round you are shooting. Be aware - the compact version of these weapons do not have this dual recoil system. I always advocate people get the big brother - it's not too big to carry, and the benefits of controlled recoil and bullet velocity are important to me as a carry weapon.
Doc