when the bolt is closed look in the narrow slot in the reciver. there will be five little half moon notches worn into it. if you can see it ill take apic of one so you can see what i mena. i have a couple 742's myself. all functioin fine and have been shot alot. clean is key w/ the older semi autos. im just sayin, if it has been shot more then it will be easy for sometone to tell who knows what to look for just incase you was tryinh to pull the wool over their eyes. not that you would, im just sayin'......