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Your best bet would be to contact Marksman directly. BTW Beeman airguns owns Marksman. See the link below
See the attached link: http://www.pyramydair.com/manual/marksman-1010
see the link below
See the attached link for the owners manual http://www.pyramydair.com/manual/marksman-1010
Crosman does not own Marksman. Crosman made a Repeatairmodel and Marksman made a Repeater model. See the link below for the Marksman Repeater owners manual.
See the link below
See the link below for the owners manual
see the link below
There is none. Its spring loaded. See the link below for the owners manual.
go to the link below.
The 1790 Biathlon Trainer is rated at 450 FPS
see the link below for the owners manual. The Marksman Repeater is a 4.5 .177 caliber pistol not a 5.5 .22 caliber pistol.