Needs to be looked at by a gunsmith.
This switch operates the Magazine cutoff. The cutoff enables the gun to open the chamber and remove the shell to insert a different shell into the chamber, but it is done while the magazine remains loaded. This way, the chamber can be emptied and the extra shells in the magazine will not automatically load. Recommend you use the link below to the Owners Manual for the A500 model. The Magazine Cutoff operations are shown on pages 29 and 30.
A burial chamber is a chamber, often below ground level, used to bury the dead.
See the link below titled BULLET
The bullet shoulder is the step below the ogive that fits into the mouth of the brass case.
1. Clearing barrel 2. Put on Safe 3. Remove magazine/press magazine release button/remove magazine 4. Lock bolt to rear/hold charging handle/press release/return charging handle 5. Inspect Chamber 6. Double check the safety 7. Procedure Complete
Here is the link below pertaining to nearly everything you need to know at the "Sarawak Chamber."
a magma chamber
The drip chamber should be below the infusion bag.
The link below may be of benefit .
Your Sears Model 2C rifle was made by Winchester as their Model 131. SOME parts are available from Numrich Gun Parts Corp. See link below that will take you to the Numrich catalog for the Winchester 131.
Casimir Zeglen invented the bullet proof vest in the 1800's. More details can be found in the related link below.
Follow the link below to the parts diagram from the Numrich Arms website.