Guys, here is the image of retaining pin from my brand new 99041.
Thanks to good heart of Eastman who came in and help me replace the firing pin, retaining pin and trigger spring on the brand new gun, I had a chance to take a good look at the original pin that we took from the gun.
I never fired this gun, so beside original (maybe 5 shots at the factory) and my (tops) 5 dry firings, this gun is brand new.
I hate to think how would this pin look like after 1,000 rounds.
Thank God for CGW and their specially designed retaining pin !!! I am sure that one (with the groove, so it can absorb the hits better) will last much longer. Take a look at this picture and bring your educated decision do you want to replace the original pin of your 99041.