If you don't mind me asking, where is your LGS? I'm over by Tampa and I have only found one shop locally that has a site tool to install sites on an HK (and he charges quite a bit). Most shops tell me that they don't see HK that often and to just use a punch...Trijicon HD's should go on every pistol! I have them on many pistols including 3 USP's and my P30. I had attempted to drift them on one my HK's like I did some of my Glocks but I was having difficulties. Now I have a LGS that will install my sights for $10 a pistol and in 5-10 minutes. I've decided to go that route from now on. You will really like the HD's
I can't speak to the usp fit (but in the market for sights for mine) but the trijicon hd needed a small amount of fitting on my 45c nothing more than a couple swipes with a file and whil tight they went in fine with the mgwMy LGS charged me $50 to install sights on a 1911, but they required filing and fitting. Do the HD's typically require some fitting?
This, I recommend the MGW universal tool.....which is a million dollars (350), but worth it. HK level of quality in the construction. I will say, there are at times the need to gently, and only ever so slightly fit the Trij HD's to the gun. Mine were a bit of a squeeze on my German HK45 and there's about a millionth ish of material in between my rear sight and slide. Can't tell if it was whatever cement the previous owner used to secure the Straight 8's, or part of the sight. Either way though, they're on there, and I'm not upset at all about it. I'll do my absolute best to take some pictures of what I mean.Definitely use a sight pusher, it will save you the headache!