My son has one and wants to put a regular blade sight and rear notch on it. Is there an aftermarket that fits the dovetails on this rascal? He is also having a hard time finding extended mags for it.

The young marine should get what he wants when he wants it, while he can.

Both my sons shot with me today. We had a good time. We plan to take a CCW class together in Feb. It is good to have them both around right now. It was a pretty day. It had to be 70 degrees and sunny. Now if the Clemson Tigers could have kept that streak going.

For the mags try:

http://www.cdnninvestments.com/

I order 15 rd 9mm from them with no complaints.. Not sure what an extended mag is for this application but cdnn has USP 45 compact and UPS 45 full size..

Also, if the web site doesn't have what he needs try giving them a call (I had to, and go prompt, polite service)

Hope this helps..

Go to HKPRO (www.hkpro,com). All things HK are answered there.
There are no extended mags for the USPC .45. When the new HK45 comes out there will be ten round mags that will fit the HK45, HK45Compact, and the USPC .45, but ten rounds are all that you are ever going to get unless you chop two mags and weld them together, and then you will only get 11 or 12 rounds.
Lots of people make sights for the HK guns. LPA, Meprolite, Trijicon, MMC, Tru-Glo, Heinie...the list is almost endless. Any of them offer several types of sights that fit the USP and USPC pistols.