Let him know that he can download an instruction manual for this pistol from the Colt Auto Collectors website at this address:
http://www.coltautos.com/pdf/Colt1908vp.pdf
The PDF file has a password, which is: coltautos.com
This gun is one of the many amazing inventions of the genius John Browning. Colt had it in production from 1908 through 1948.