There is a pin that has to be driven out. It passes thru the front section of bolt and is off-center
the model 583.16 is a j.c. Higgins "model 10" bolt action. sears has issued a volentary recall on them. at the time of the recall they were offering a $160 "finders fee" for the return of the bolt from the shotgun .
this rifle was made by marlin it was marlin glenfield model 10 try Numrich arms in West Hurley NY
http://www.boydsgunstocks.com/JC-HIGGINS-583-10-12-GA-STOCK-WALNUT-SEMI-INLET-p/300-238.htm
your gun is a model 10, 12 gauge bolt action repeating shotgun made by Sears/High Standard in 1948 Probably during the period of 1948 through 1952.
Depending on which model and gauge, I have bolts. It will be very difficult to find the 12ga bolts from models 583.1-583.21, since Sears has been recalling them and paying good money for the last 10 years or more.
High Standard shotguns made before 1969 did not have serial numbers except for some exported models and the Model 10-A bullpup. Your shotgun has no serial number.
Consult the owner's manual. If you don't have one, find a gunsmith.
J.C. Higgins Model 101.1 is worth uo to about $100 its most valuable in the field good rabbit gun. Enjoy it.
10-100 USD
The J C Higgins model 41 /103 19770 Was made by Marlin Firearms.1959 .103 is the Sears vendor code for Marlin .The model 41 is the same as the the Marlin Glenfield model 10. These are very nice little rifles that are well known for accuracy.
your gun is Sears JC HIGGINS MOD 10 583 24 bolt action 16 gauge no recall s made 1955 by High Standard very good high quality shotgun .a modern classic and usually one of the better shooters worth around 100 to 150 dollars
10-125 usd