The first answer is correct. Though having a copy of the owner's manual is always a very good idea. It is also true that most bolt action rifles have a release mechanism to extract the bolt for cleaning and maintenance.
I believe that the marlin model 783 holds 7 rounds.
Between 50-75 dollars.
Try Numrich Gun Parts Corp.
Bolt removal on this model is fairly straightforward and simple. First work the bolt to the rear as if to chamber a shell. Second pull trigger and continue to pull the bolt to the rear and it will slide out the back of the reciever. To reinstall bolt complete this sequence in reverse.
Between 50-75 dollars.
Just pull the trigger as you pull bolt out.
13650665 is the serial number. It is a Marlin 783 22 wmr rifle. what year model is it?
Your Marlin model 783 was made in the year 1971.
The best that I can do is say that your marlin model 783 was made between the years 1971-1988.
But listing the serial number of your Marlin in this question.
50-90 dollars depending on overall condition of your Marlin model 783.
Open the bolt, pull it to the rear, hold the trigger back and remove the bolt. sales@countrygunsmith.net