Well, good, I'm glad to be wrong....again! Married to my dear Bride for 47 years, so it's nothing new! My apologies Sir. I've been reading everything I can find about the SRO. I have a 510 Holosun in green on my Ruger PC-9 and their 507 or 508 would be my next option, if I was staying with Holosun. My pistol isn't "available" to me yet but might I ask what grain- weight ammo did you use for break-in? It might've been the same You-Tube guy who said his SRO gets clipped by brass and said HK want's 147 grain ammo used for break-in I've watched so many, they're all running together! I also have the XS Sights work-order form printed out for a pair of their Suppressor sights installation.