Your best bet would be to contact Marksman directly. BTW Beeman airguns owns Marksman. See the link below
The 1790 Biathlon Trainer is rated at 450 FPS
To obtain an owner's manual for a Marksman 1790, you can start by visiting the manufacturer's official website, where they may offer downloadable versions of their manuals. Alternatively, you can contact their customer service directly for assistance. Online forums and dedicated airgun communities may also have user-uploaded resources or tips on where to find the manual. Lastly, searching for the manual on websites that specialize in vintage or discontinued products might yield results.
No It is not a repeater , you must re cock and and hand load a pellet after each shot!
To load a Marksman 1790 series pellet rifle, first ensure the rifle is pointed in a safe direction and the safety is engaged. Open the breech by breaking the barrel down, then insert a .177 caliber pellet into the breech with the pellet’s skirt facing the barrel. Close the barrel securely until it locks in place, and then disengage the safety before taking your shot. Always follow safety precautions and manufacturer's instructions when handling the rifle.
Beeman airgun co owns Marksman. you can try this addresses. Contact them for help. Beeman Precision Airguns 10652 Bloomfield Ave Santa Fe Springs, CA 90670 562-968-5891 or 800/227-2744 FAX 562-968-5823
I would start with Beeman air gun co. They own the Marksman line of air guns (See the link below) or go online and look up "air gun repair" and locate someone near you to repair the rifle. Or see the link #2 below.
10
I would search the web for "Air gun Repair" and locate a shop near you that can repair it or see the link below for shops that repair air guns.
1790 + 1959 = 3749
1790
$1790 is £1475.10
1790/7 = 255.714285