In addition to being used in the FN P90 and FN Five-seveN, the 5.7x28mm cartridge has subsequently been used in the FN PS90 carbine. By 2006, FNs 5.7x28mm firearms-the P90 personal defense weapon and Five-seveN pistol-were in service in more than 40 countries, and in the United States, 5.7x28mm firearms are currently used by numerous law-enforcement agencies, including the U.S. Variations of the bullet itself include the SS190AP bullet (armor piercing, 1994), the heavier SB193 for subsonic loads, the L191 tracer, and the SS192 with a soft core instead of a steel penetrator. Designed to replace the 9x19mm Parabellum, the 5.7x28mm is aīottlenecked cartridge similar to the 22 Hornet or 22 K-Hornet with a long, pointed bullet. 224-inch-diameter bullets like other 22 centerfires. The “5.7” part of the name might fool you since this does not use a. In our opinion, we believe there are significant reasons not to.Īccording to the Shooters Bible Guide to Cartridges, FN Herstal of Belgium started the development of the 5.7x28mm in 1986 as a sub-machine gun round for the FN P90 personal defense weapon (PDW) and FN Five-seveN pistol. Down the road, it will certainly be interesting to compare a selection of uppers against each other, and well continue to pit guns in alternate AR chamberings, but for now, we want to gauge whether wed plunk down $600 to $700 after taxes for the AR57 PDW Upper. It includes an AR57 Flash suppressor with standard 1⁄2X28mm threads), a custom pistol grip with battery and accessory compartment, M4 Carbine 6-position stock, and four AR57 50-round magazines. The whole carbine weighs 7.45 pounds and is 33 inches long with a 16.04-inch standard barrel. The PDW upper was attached to a CMMG Model 4SA lower, which lists for $296 from CMMG a whole-gun-to-gun basis, a new 57Center AR57A1 PDW Carbine costs $1099. New AR57 PDW Upper units are available from the company or from Brownells for $696. The AR57 PDW Upper came to us via Collectors Firearms in Houston (which listed the used 5.7X28mm upper for $550. We recently pitted once such device, the 57Centers piston-driven AR57 PDW Upper in 5.7X28mm, to three previously tested guns that were highly rated, the direct-impingement Stag Arms Model 2T 223 Rem/5.56x45mm NATO, $1125, Smith & Wessons M&P 15-22 No. The uppers usually cost slightly more than half the price of a complete gun, and they snap onto AR lowers, which gives owners a choice of cartridges to shoot on a given day. These chamberings appear in dozens of rifles and dozens of replacement uppers. The evolution of the AR-15 continues apace, with a host of manufacturers building out the 223 Rem/5.56mm modular-rifle concept to a bevy of cartridges that offer more power (6.8 SPC, 30 Carbine) or cheaper operation (22 LR, 9mm).
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