I added one to my Expert 45acp when I first purchased her it was they very first thing I did after that was the Meprolight night sights adjustable suppressor height sights but I wouldnt do it for my 9mm tactical due to various post on the steel could seriously gouge the front catch to the magazine and on the other site was a guy who found out the hard way by mags just falling out of the gun?
If you have the HK45C release in small frame USP, the jet funnel magazines fall out when shooting.
I would appreciate it if you do not ask please how I learned that.
However, if you have a Tactical or an Expert without jet funnel, the regular magazines work just fine.
The vast majority of my magazines are very well used previously, in many cases with an unknown number of past owners and I have never had an issue.
I do not know if there were ever Elites models without a jet funnel.
Also, I do not know what happens with the 9mm and .40 S&W conversion magazines for the large frames.
They are made out of the same translucent plastic as the cheaper jet funnel magazines, so perhaps they will fall as well. I am too lazy to try it.