I used these recoil-reduction-system-stuff only in my Browning HP and SIG 226.
Both cycled not so good afterwards. With 9mm+P there was no problem. But with normally-loaded 9 millies, there was often a hick-up.
Let's say that these two guns where really flawless with stock springs and only began to irritate after I put the reduction system in.
Conclusion: in my gun-vault there are now two, not-used DPM systems.
Specially for SD, I wouldn't advise it.
To answer your question directly: I never tried these in one of my Glocks, but I learned with trial and error: "Never change a winning team".
Just my 2cnts folks!
Last edited by bingoke; 05-17-2013 at 10:24..