Yes, the 9mm and .40 USP's were available for sale in the US prior to 9/94. The .45's weren't available for sale here until 1995, but that doesn't mean they (and more importantly) the mags weren't in production before the onset of the 94 crime bill. The USP was in development for many years prior to this, and it is perfectly reasonable to think a boatload of mags were manufactured prior to 9/94. There are several anecdotal stories of people in the industry who recall seeing USP .45 mags here in the US (even though the gun wasn't available yet) prior to the AWB as well as several magazine articles that featured photos of production USP .45's with a 1994 date code. So, even though they were not for sale here yet, they were at least in production prior sometime in 1994. The USP compacts get a little trickier, but once again, they were in development for many years and it can be argued that some of these mags were actually made prior to the cuttoff date. The only ones who know for sure are HK Orbendorf, and they haven't made any public statements that I know of either way. HK USA has, but they are really nothing much more than a warehouse - they import the stuff, but don't make anything. They did not import any preban USP .45 or USP compact mags, and so make the claim that any here are illegal imports intended for the european market. HK USA seems to be of the opinion that any HK stuff in this country that they did not import themselves does not exist, which is not necessarily the case.
Rocko