I have actually only ran it on my MK23 pistol. For my MP5s I use a Gemtech Raptor II tri lug QD or Gemtech MK9K tri lug QD. Hoping soon to get up to the range and i'll throw the TiRant on one of my MP5s with a threaded muzzle and compare it to the Raptor 2. The raptor will probably be quieter since its a 9mm can but the TiRant is definitely more modular. Ti-Rant is also a lot lighter than the R2Hey buddy, which HKs do you use it with? Do you have any other silencers? Feedback? Comparisons? This is my first but I am thinking about getting a dedicated 9mm can for my USP 9SD and my MP5s.