okay, I've tried to do my research…I've googled the heck out of this and read dozens of threads of people arguing across different forums… and it looks like Bill Geissele himself recommends NOT using KNS pins with his triggers because they are slightly a different size and not as strong …I read this in a few forums, but the threads were all started back in like 2008-2009. This was before the Super Dynamic line came out… to get down to it, my questions is, 'is it okay to use KNS pins with the Geissele Super Dynamic Combat trigger?' Mr. Geissele gave two reasons for not using KNS pins…they are too small (his pins are slightly larger) and not hard enough (his pins are specially treated and extremely tough) BUT, that was 5 or 6 years ago when he said that… AS OF NOW, on Geissele.com the SD-C trigger says that it uses a standard mil-spec pin size. and if thats the case then problem #1 is solved, because so does KNS. secondly, the KNS pins I want to use are the KNS Gen ST version which are "the strongest pins that can be produced" according to KNS. And these pins weren't around when Mr. Geissele made those statements. heres a link to the pins: http://www.knsprecisioninc.com/gen-st-non-rotating-trigger-hammer-pins-154-diameter-dark-earth.html heres a link to the SD-C trigger: http://geissele.com/super-dynamic-combat-trigger.html I KNOW THE PINS WILL WORK, BUT I WANT TO KNOW IF I THERE WILL BE ANY NEGATIVE EFFECTS FROM USING THEM. OTHERS HAVE SAID IT IS POSSIBLE IT DAMAGES THE TRIGGER SOMEHOW… and I know a lot of people out there hate KNS pins. thats fine. go ahead. don't use them. But i've had my pins walk out on me and fall into the receiver..twice. yes, even after I made sure it was installed correctly. So i will continue to use KNS pins in EVERY build.