I have had this gun for 20+ years and it probably doesnt have 200 rnds through it (hunting gun) I also have my fathers much older 7600. Recently when shooting the older gun I noticed that the slide doesnt unlock until you move the fore grip. This I am told is quite normal and makes sense seeing as my 870 and BPS are the same way. My 7600 will open when shooting. Sometimes the cartridge is 75% exposed after the shot. I will mention that I have only noticed this when shooting from the bench. When I hunt I shoot and reload in case I need another shot. (LOL I never have)