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Remove trigger pin with action un-cocked . http://www.histandard.info/manuals/sears/rfrifles/index.html
i think now the only way to find parts is to buy a used gun from someone to fix your own.
I'd check with Numrich Gunparts at the link >>>>
I found parts for my model 29 at Numrich Gun Parts in New York. Their web site is e-gunparts.com
Not recommeded for the casual owner. Find a good gunsmith.
Disassemble to do what? To remove the trigger group you need to push out the two pins in the receiver to remove the trigger group. To remove the bolt you need to take the barrel off which requires an armorers barrel wrench.
The wooden forend on that gun extends back along both sides of the receiver. There is a big honking screw that goes through the wood and the receiver from left to right. Remove that screw and you will be able to remove the trigger group downward and rearward. Please be careful not to lose the disconnector from the right side of the trigger group. Do not dry fire the trigger group. In fact, my advice is not to attempt to disassemble the trigger group unless you are very familiar with that action. It is easy to take apart, but difficult to reassemble. sales@countrygunsmith.net
There is a pin that has to be driven out. It passes thru the front section of bolt and is off-center
Not very easily. The barrel is not designed to be removed by the user. With the gun empty, work the bolt to cock the hammer. Drift out the two pins that retain the trigger guard assembly and that can be removed. No further action dis assembly is advised.
More than one JC Higgins 12 g semi. and more than one set of instructions. You did not give us a model number.
The manual can be downloaded here: http://www.histandard.info/manuals/sears/index.html
At a good gunsmith's shop. Maybe Numrich's Gun Parts (search gunpartscorp) For the complete trigger guard assembly, including trigger, safety, springs, pins etc., you can get it from Numrich, Midway USA, Brownells or direct from Marlin. If it's just the trigger or other individual trigger guard parts you need, you'll have to get those from Numrich for a different model Marlin.