FN Five-seven:-
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The FN Five-seven, trademarked as the Five-seveN, is a semi-automatic pistol designed and manufactured by FN Herstal in Belgium.[9] The pistol is named for its 5.7-mm (.224 in) bullet diameter, and the trademark capitalization style is intended to emphasize the manufacturer's initials—FN.[14]
The Five-seven pistol was developed in conjunction with the FN P90 personal defense weapon and the FN 5.7×28mm cartridge.[15] The P90 was introduced in 1990, and the Five-seven was introduced in 1998 as a pistol using the same 5.7×28mm ammunition.[7] Developed as a companion pistol to the P90, the Five-seven shares many of its design features: it is a lightweight polymer-based weapon with a large magazine capacity, ambidextrous controls, low recoil, and the ability to penetrate body armor when using certain cartridge types.[16]
Sales of the Five-seven were originally restricted by FN to military and law enforcement customers, but since 2004, the pistol has also been offered to civilian shooters for personal protection, target shooting, and similar uses.[17][18] Although offered only with sporting ammunition, the Five-seven's introduction to civilian shooters was met with vocal opposition from gun control organizations such as the Brady Campaign, and the pistol has been subject to ongoing controversy in the United States.[19][20]
The Five-seven is currently in service with military and police forces in over 40 nations, such as Canada, France, Greece, India, Poland, Spain, and the United States.[21] In the United States, the Five-seven is in use with numerous law enforcement agencies, including the U.S. Secret Service.[14][22] In the years since the pistol's introduction to the civilian market in the United States, it has also become increasingly popular with civilian shooters.
Design
The Five-seven is a semi-automatic delayed blowback pistol chambered for FN's 5.7×28mm ammunition.[9] The pistol appears hammerless, but it has a concealed hammer.[9] Polymer materials are used extensively in the pistol's design, and even the steel slide is encased in a polymer shell.[8][12] In addition to providing reduced weight and greater resistance to corrosion, this also prevents unwanted light reflection.[13][31] The slide's polymer shell gives the pistol the appearance of being constructed entirely of polymers, but the slide interior, barrel, trigger, springs, pins, and similar parts are all steel.[8][12] However, the pistol is unusually lightweight, weighing only 744 g (1.6 lb) with a loaded 20-round magazine.[13][24]
The Five-seven is a full-size pistol, having an overall length of 208 mm (8.2 in), a height of 137 mm (5.4 in), and a max width of 36 mm (1.4 in).[9][10] It has the same grip angle as the distinguished Browning Hi-Power and M1911 pistols.[32] Despite the considerable length of the pistol's 5.7×28mm ammunition, the grip is not particularly unwieldy—the distance from the trigger to the back of the grip measures 69.85 mm (2.75 in), which is identical to a U.S. Military issue M9 pistol chambered in 9×19mm Parabellum.[14][24] The Five-seven barrel is cold hammer-forged and chrome-lined, with a total length of 122 mm (4.8 in) and a rifled length of 94 mm (3.7 in).[9][18] The barrel has eight rifling grooves with a right-hand twist rate of 1:231 mm (1:9.1 in), and it weighs 113 g (0.25 lb).[9][12] It has a stated service life of 20,000 rounds[8] and the Five-seven is noted for being very accurate.[10][20][23]
Current models of the Five-seven are single-action, having a short and light trigger pull of 2 to 3 daN (4.4 to 6.6 lbF).[9] They have a Picatinny rail for mounting accessories, and a magazine safety mechanism that prevents the pistol from firing without a magazine inserted.[9] The grip texture on current pistols is extensively checkered for a superior hold, and each side of the slide has a series of narrow ridges at the rear to aid grasping.[18][23] The trigger and trigger guard surfaces also have grooves to reduce finger slip, and the trigger guard is elongated to ease firing while wearing gloves.[24] The Five-seven is currently offered in two different frame finishes (standard black or flat dark earth), and two different iron sight systems (adjustable sights or low profile fixed sights).
Ammunition:-
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5.7×28mm cartridges as used in the Five-seven. From left to right: SS195LF hollow point, SS196SR V-Max, and SS197SR V-Max.[23]
Particularly significant to the design of the Five-seven pistol is the small caliber, high velocity bottlenecked cartridge it uses.[24] The 5.7×28mm cartridge was created by FN Herstal in response to NATO requests for a replacement for the 9×19mm Parabellum cartridge, which is commonly used in pistols and submachine guns.[28] The 5.7×28mm cartridge weighs 6.0 g (93 grains)—roughly half as much as a typical 9×19mm cartridge—making extra ammunition less burdensome, or allowing more ammunition to be carried for the same weight.[13][34][35] Since the 5.7×28mm cartridge also has a relatively small diameter, an unusually high number of cartridges can be contained in a magazine.[36] The cartridge has a loud report and produces considerable muzzle flash, but it has roughly 30 percent less recoil than the 9×19mm cartridge, improving controllability.[20][24][35] Due to its high velocity, the 5.7×28mm also exhibits an exceptionally flat trajectory.[31]
One of the design intents for the standard 5.7×28mm cartridge type, the SS190, was that it have the ability to penetrate Kevlar protective vests—such as the NATO CRISAT vest—that will stop conventional pistol bullets.[35] Fired from the Five-seven, the 5.7×28mm SS190 has a muzzle velocity of roughly 650 m/s (2,130 ft/s) and is capable of penetrating the CRISAT vest at a range of 100 m (109 yd), or 48 layers of Kevlar material (roughly equivalent to two stacked Level II Kevlar vest panels) at a range of 50 m (55 yd).[27][34] It is also capable of penetrating a PASGT vest at a range of 300 m (328 yd) or a PASGT helmet at a range of 240 m (262 yd).[27] FN states an effective range of 50 m (55 yd) and a maximum range of 1,510 m (1,651 yd) for the 5.7×28mm cartridge when fired from the Five-seven pistol.[12]
In testing conducted by Passaic County, New Jersey Sheriff's Department, the 5.7×28mm SS190 penetrated to a depth of 27 cm (11 in) in bare ballistic gelatin, and a depth of 23 cm (9 in) in gelatin protected with a Kevlar vest.[8] In testing, the SS190 and similar 5.7×28mm projectiles consistently turn base over point ("tumble") as they pass through ballistic gelatin and other media, using the 21.6-mm (.85 in) projectile length[12] to create a larger wound cavity.[8][13][16] However, some are skeptical of the bullet's terminal performance, and it is a subject of debate among civilian shooters in the United States.[16]
The 5.7×28mm projectile potentially poses less risk of collateral damage than conventional pistol bullets, because the projectile design limits overpenetration, as well as risk of ricochet.[8][32][37] The lightweight projectile also poses less risk of collateral damage in the event of a miss, because it loses much of its kinetic energy after traveling only 400 m (437 yd), whereas a conventional pistol bullet such as the 9×19mm retains significant energy beyond 800 m (875 yd).[31] This range exceeds the engagement distances expected for the 5.7×28mm cartridge's intended applications, so the cartridge's limited energy at long range is not conversely considered to be disadvantageous.[31] Since the 5.7×28mm SS190 projectile does not rely on fragmentation or the expansion of a hollow-point bullet, the cartridge and pistol are considered suitable for military use under the Hague Convention of 1899, which prohibits the use of expanding bullets in warfare.[16]
Ballistic performance summary for various 5.7×28mm cartridges
SS190 SS195LF SS197SR EA Protector EA Varmintor EA S4
Projectile weight 2.0 g (31 gr) 1.8 g (28 gr) 2.6 g (40 gr) 2.6 g (40 gr) 2.3 g (36 gr)1.8 g (28 gr)
Muzzle velocity 650 m/s (2,130 ft/s) 625 m/s 520 m/s 610 m/s 640 m/s 770 m/s
Muzzle energy 424 J (313 ft-lb) 350 J (260 ft-lb) 350 J (260 ft-lb) 480 J (355 ft-lb) 480 J (355 ft-lb) 535 J (395 ft-lb)
Courtesy:- wikipidia