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North American Arms model NAA22S mini-revolver, chambered in .22 Short.
Examples of revolver mouseguns include the North American Arms Mini Revolver, which is a spur trigger design with birdshead grips. The North American Arms Mini Revolver is styled very much like popular pocket revolvers of the 19th Century, but is made entirely of stainless steel.
Smith & Wesson’s “J-Frame” series of revolvers are a common choice for mouseguns. They are generally more reliable than their automatic counterparts, and offer an exceptional power-to-weight ratio, especially the lightweight AirLite and Airweight lines. On the other hand, they offer only five shots (auto mouseguns often hold more rounds), and have considerably greater recoil, especially in .357 magnum.
[edit]Historical perspective
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Newer models have a “flattop” upper receiver with a Picatinny rail, to which the user can attach either a conventional sighting system or numerous optical devices such as night vision scopes.
The M16 utilizes direct impingement gas operation; energy from high-pressure gas tapped from a non-adjustable port built into the front sight assembly actuates the moving parts in the weapon. Combustion gases travel via a gas tube above the barrel directly into a chamber in the bolt carrier behind the bolt itself, pushing the carrier away from the bolt. This reduces the number of moving parts by eliminating the need for a separate piston and cylinder and it provides better performance in rapid fire by keeping reciprocating masses on the same axis as the bore.[citation needed]