Rifle-Saws.—Short files made to fit in the grooves of a rifle. They are usually attached to a rod, near the end, and drawn to and fro through the gun for the purpose of filing the grooves down to greater depth, where such a thing is required. In cases where new grooves are to be cut in a smooth-bore, the rod passes through a rifle-guide, which forces the saws to take the proper twist through the barrel.
Rim-Fire.—A cartridge whose ignition is around the rim instead of in the centre, and which, consequently, can be used only by some arm striking the cartridge at the rim.
Rouge.—A fine powdery material, used for putting a high polish upon the surface of well-finished metals. It is usually applied by rubbing in connection with soft leather, either in the form of a buff or otherwise.
Saturated Solution.—A liquid holding in solution as much of some particular soluble chemical as it will dissolve. For instance, if salt be put in water until a portion remains undissolved at the bottom of the vessel, there is in the liquid a saturated solution because it holds in suspension all the salt that it can dissolve.
Scatter.—When a shot gun throws the pellets over a range of space unusually wide, it is said that it scatters.
Scroll Guard.—An extension downward from the trigger guard, to steady the hand. It is designed to answer the same as pistol grip.
Sear.—Sometimes called dog, which see.
Sear-Spring.—The small spring in a gun-lock which presses the sear into the notches of the tumbler.
Set-Triggers.—See double-triggers.
Side-Lever.—A lever which works at the side of a breech-loader.