You should have received a manual when you purchased your pistol but all current manufacturers have their manuals available online for download in .PDF formant.
The best way to find and print out your pistol manual (even old ones) is to do a proper search using your favorite search engine (e.g. Google, Start Page etc.)
If you use the following format, you should get a list of sources to choose from but first try the one from the manufacturer, such as Ruger or Colt etc..
Be specific in your query:
"Manual for Ruger LCP" or "Manual for S&W M&P Shield"
The manuals will be 5-50+ pages long so suggest that you use the "Print both sides" option on your printer.
