Where can I find a manual for a Marksman Repeater bb pistol?

A manual? Dunno about that, but to load the pistol you tip up the loading block at the front of the barrel. to load a pellet or dart, insert it in the round hole and close. To load bb's, load them into the other hole. To c ock the pistol, pull back on the slide until it stops, then push it back forward. The safety is the push on by the trigger guard. The position with red paint exposed is "fire". Hope this helped.