Just under the barrel you will find a large tube with a screw on cap. Open it and slide the 12 gram C02 bottle in nose first. Screw on the cap thumb tight. Do not over tighten. It's ready to shoot. See the link below for the owners manual.
Unscrew the cap under the barrel and slide a C02 cartage "Nose" in first and tighten down the cap. This will charge the firing system. This is a Crosman model 160 made for Sears. See the link below for the owners manual.
you unscrew the cap at the bottom of the pistol. Then you place the C02 bottle in upside down. The neck is facing the opening. Screw the cap back in thumb tight DO NOT USE PLIERS. If you want the owners manual go to www.crosman.com and click on Owners manual at the bottom of the page.
They fill the tube from the bottom then seal the end. The cap is already in place when the tube is filled.
On the end of the magazine tube there is a threaded-on cap. Remove this cap. You will now find a "spring plug" inside the front end of the magazine tube. Carefully pry this spring plug out of the magazine tube. Put a pair of safety glasses in the proper location on your face because once you get this spring cap close to the end of the magazine tube the magazine follwer spring will push it out of the mag. tube faster than you can say"Oh sh.. crap". Once this spring cap is out you can pull the magazine spring out if it already hasn't landed in the living room. You can now insert or remove a cartridge number restricting plug. Next you'll need to push the extended magazine spring back into the magazine tube and re-install the spring end cap. To get the spring plug in flush with the front edge of the magazine tube, tap it into place with a plastic screwdriver handle to prevent distorting the thin walls of the mag. tube. Replace the screw-on end cap and that's it.
A toothpaste tube.
To remove the magazine tube on the Stevens 87D, first ensure the firearm is unloaded. Then, unscrew the end cap at the front of the magazine tube. Slide off the end cap and follower, then push the magazine spring and follower out through the rear of the tube. Finally, slide the magazine tube out of the receiver.
"Stem cap" typically refers to the top cap of a bicycle stem, which is the component that secures the handlebars to the steerer tube of the fork. It provides a cover for the top of the steerer tube and may serve as a point for attaching accessories such as a computer or light.
The magazine capacity restriction "plug" is removed in a similar manner for most all pump action or semi-auto shotguns. Remington shotguns are quite easy to remove. At the very front end of the magazine tube you will find a screw-on end cap. Remove this end cap and you should notice a cap that has been pushed into the magazine tube. This cap is friction fit into the tube and under pressure from the magazine follower spring so put a pair of safety glasses on your face before you begin removal. This cap usually has a hole in the center of it. Use a flat blade screw driver to carefully pry this internal cap out the front end of the magazine tube using the hole in the center of the internal cap. Be careful as this spring is under pressure and may come flying out rather quickly. Once the internal cap is removed the spring will relax and grow in length considerably. The restriction plug is captured inside this spring. Remove the plug and start pushing the magazine follower spring back into the tube. Once you get the spring almost all the way back into the mag. tube, put the internal end cap back in and gently tap it into the tube with the back end (plastic handle) of the flat blade screw driver. Push this internal cap in until it is flush of just below flush with the end of the tube. Replace the forearm and screw-on cap and go have a beer.
sst yellow cap tube or lithium heparin tube
Remove the magazine tube cap. The plug is inserted inside the spring, and cap replaced. You may want to have a gunsmith do this. It will take less time for him to do it than it will for you to find the springs that got loose.
Because there is no air in the tube, but if you open one and re-cap it, you admit air and it will harden eventually.