You can get a manual at S&W's website for free.
Look in the owner's manual. You can get one for free from S&W.
Take it to a gunsmith and ask for help
Yes, but it will take some doing to find one.
You need to ask a gunsmith for help.
S&W never made a Model 69 semi-auto pistol
Which one?
take apart the whole gun
Ask a gunsmith for help
Ask a gunsmith for help or ask the maker for a manual
Best left to a gunsmith
Can't be answered correctly without knowing who made it.
Take it to a gunsmith