First gun?
Welcome , responsible Citizen
An Ak mount woud require milling a perfectly flat area to place the mount, something a bit tricky as the round reciver wall isnt the thickest and the curve not conductive to a reasonable ammount of surface area to support the mount.
Also, the AK mount places the scope rather high oon the AK, 'cause its a fairly 'high' reciver, and the AK mount on a Mosin would likely place the scope in a very high and shootable akward position.
You can find mounts like the PU or just buy a real Russian made PU scoped M-91/30 for about 600$ or so. Or you can get a mount from a place called accumounts.com and look in the mosin section. The PE scope set up solderd and screwd atop forward on the reciver would be the easiest to get done "Right" with an as issued M91/30. Soldering, drilling and tapping with no machining and the same or better results.
As well, a bolt with a bent handle is nessessar to use a scope on the rifle too.
A nice Russian built and issued PU scoped Russian refurb would be cheaper in the long run.
To collector shooters, the original isnt only cheaper, but its "authentic', so it would keep its $$ value rather than lose it but building a 'fake' sniper for equal or more $.
Great Gun, your now a Rifleman, buy a good cleaning kit, and you need to practise practise and practise some more.
Before you shoot, dissassemble and clean the rifle meticulasly.
Remove all grease and cosmoline a wax like preservative.
be sure to scrub the chamber with a brake cleaner or a strong solvent. Buy a good cleaning kit and cleanthe rifle EVERY time you shoot it. A swiss military "roll up" type .30 cal cleaning kits is very good for such. It has a chamber scrub brush and you clean from the chamber end.
Find and keep the tools and sling that should come with the rifle, and learn how to use them, they are all that you need to keep your rifle for your life time.
If you use common "corrosively primed ammo" you need only add the extra step of boiling water and pouring through the chamber side, and brushing, then rinse and then finnisih up with solvents, patches and oil to protect the bare steel.
Suprizingly, hot water isnt bad for your bore, it dissolves the salts used in the priming and flushes them out, preventing horrific rusting. Standard Soviet practise when they didnt have aques solvents to issue. The heat of the water heats the barrel and its self drying in less than a minute, and with solvent and patches after , a snap to keep in perfect order, with a light coat of oil to protect the bare steel of the bore from rust and air moisture.
If your bolt becomes "sticky' or just hard to open, you need to clean it.
pay good attention to the chamber, and locking recesses in the reciver where the bolt lugs rotate into.
To use the safty properly, hold the rifle as if you were gonna shoot it, then lower the buttplate into the crook of you are/elbow. Keep ahold of the forend with your left hand, remove your right hand from grasping the stock behind the trigger. Then reach with thumb and forfinger to the bolts cocking knob at the rearmost onthebolt. Then Grasp it firmly and pull back and rotate to the left. It will engauge a knotch on the left side rear of the reciver and lock the bolt shut and utterly impossible to fire.
To remove the safty, place the butt in the same place in the crook and regrasp the knob, turning it to the right, and it will go forward slightly. It is aagian ready to fire.
Useing the crook of your arm doubles you strength because your bicept and forarm work together and make useing the safety easy.
I like Mosin Nagants, ALOT!!!!!! Your off to a great start.
Carry on.