The front sight carries a single tritium insert and the rear sight has a tritium insert on each sight of its open square notch. The tritium inserts have a white polymer ring around them. The P290RS excellent high profile sights come with tritium inserts (SIGLITE). This helps to insure reliable operation when a compact pistol's slide recoils for only a very short distance. The P290RS employs a double nested recoil spring system riding over the polymer guide rod. In short, the principal desirable qualities of a Nitron finish are hardness wear resistance and lubricity, or "slickness." The various forms of DLC can be applied to almost any material that is compatible with a vacuum environment. DLC thus has some of the properties of diamond.Īlthough it appears smooth to the naked eye, DLC actually has the form of a microscopic cobblestone street. "DLC," in turn, is the acronym for Diamond-Like Carbon. SIG Sauer's Nitron finish is a thin layer of amorphous "DLC" that both creates a hard protective coating and enhances lubricity. The P290RS slide is made of CNC-machined 416 series stainless steel machined from bar stock with a black Nitron finish (or an optional satin finish slide). The method of operation is a modified Browning-type: short recoil, locked-breech and a conventional cam-dropped barrel system, but with a squared-off area above the barrel chamber locking into the slide's ejection port and additional locking with the bell-shaped muzzle end of the barrel locking into the front end of the slide. The weight with an empty magazine is 20.5 ounces (581.2 grams). The 2.9-inch (73.7mm) barrel has six grooves with a right hand twist of one turn in 10 inches (254mm). Overall length of the P290RS is 5.5 inches (139.7mm), with an overall height of 3.9 inches (99mm) and a width at the grip panels of 0.9 inch (22.9mm). The SIG Sauer P290RS (Re-Strike) is a somewhat improved version of the earlier caliber 9x19mm Parabellum P290, a DAO (Double-Action Only) handgun that's larger than the immensely popular SIG Sauer P938, but smaller than Glock's smallest nine, the Model 26. But, the real question is, have they already gone too far? Are they already too small for many shooters, especially women and the generally inexperienced? Shotgun News recently received a pistol from SIG Sauer that goes slightly back in the other direction. There is certainly a limit imposed by human anatomy as to just how small these pistols can go. Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion or state of rest. This is so because the greater the mass of the handgun, the greater amount of the force generated by the cartridge that must be diverted to overcoming the handgun's inertia and the lighter the pistol, the less of the force generated by the cartridge that will need to be diverted to overcome the pistol's inertia. And, the less the mass of the handgun, the greater will be the recoil impulse. The larger the caliber, the greater the force it will most often generate. Other factors important in determining the magnitude of the forces involved are the mass (or weight) of the handgun and the force generated by the cartridge. Pistol envelopes almost immediately began to shrink and the dawn of the "compact" handgun was upon us.Ī firearm's recoil impulse is a consequence of Newton's third law of motion, which states that when one body interacts with a second body, the force of the first body on the second is equal in magnitude but opposite in direction to the force of the second body on the first. As a consequence, manufacturers were forced to rethink the concept of large handguns that could hold no more than 10 rounds. It included a prohibition on the manufacture for civilian use of so-called "assault weapons" and magazines with a capacity greater than 10 rounds. The Federal Assault Weapons Ban (or Public Safety and Recreational Firearms Use Protection Act) was a subtitle of the Violent Crime Control and Law Enforcement Act of 1994, a federal law passed by Congress and signed into law on Sept. 40 S&W cartridge was introduced and police departments raced hell bent to abandon their 9x19mm pistols and adopt those in the much ballyhooed new round, which eventually was perceived by many as neither fish nor fowl. ![]() More rounds meant more firepower, although in all likelihood less hit probability. Manufacturers scrambled to introduce handguns with the largest capacity magazines. The first clearly defined trend during that time was the development of service-size 9x19mm Parabellum pistols with high-capacity magazines. ![]() By the mid-1970s revolvers and their limited firepower were clearly moribund throughout law enforcement agencies in the United States. During the last 40 years, we have witnessed some dynamic developments in the evolution of semi-automatic pistol designs and equally, if not more so, in specific trends.
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