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In May 2022, United States Special Operations Command selected SIG Sauer to deliver its MCX Rattler personal defense weapon, which can be chambered in both 5.56 NATO and .300 Blackout. With a barrel length of 5.5 in (140 mm), the .300 Blackout allows the Rattler to fire a powerful round while being compact. [13]
A new barrel is the minimum required component to convert a standard AR-15 to .277 Wolverine. In order to load heavier (therefore longer) bullets to magazine length without the problems of seating the bullet's ogive into the case mouth, the Wolverine case is shortened to approximately 39 mm from its 45 mm parent brass.
The MCX is designed to deliver optimal performance with .300 AAC Blackout and an optional suppressor. [11] The barrel's profile is tapered at the crown to enable the installation of muzzle devices and direct-thread sound suppressors without the use of washers that degrade performance and enables the devices to self-center on installation.
A limited edition STG-556, a clone of the Steyr AUG A3, had a production run of only 1,000 rifles. There was a limited production of 232 rifles produced with an 18.5" heavy barrel after tests proved that length provided optimum accuracy over the 24" length due to barrel harmonics.
The X95 is chambered in either 5.56×45mm NATO or .300 AAC Blackout. The .300 BLK configuration features a gas regulator for both supersonic and subsonic loads. X95 330: Carbine configuration with a 330 mm (13 in) barrel and a 580 mm (22.8 in) overall length; X95 380: Assault rifle configuration with a 380 mm (15 in) barrel and a 640 mm (25.2 ...
The SIGM400 Predator is a rifle while the SIGPM400 Elite PSB is a pistol. The rifles are chambered for either 5.56×45mm NATO with 14.5-inch (37 cm), 16-inch (41 cm), 18-inch (46 cm), or 20-inch (51 cm) barrels threaded 1/2x28, or chambered for .300 AAC Blackout with 9-inch (23 cm) or 16-inch (41 cm) barrels which are threaded 5/8x24 for muzzle devices such as sound suppressors.
Barrel length: 6 in (15 cm) Cartridge.300 AAC Blackout: ... The weapon is suppressed and it can be made even quieter by using heavy subsonic .300 Blackout ammunition.
The Heckler & Koch HK437 chambered in .300 Blackout and features a 7- and 9- inch barrel was originally announced along with the HK433 in 2017. In late 2022, the Ministry of the Interior, Municipal Affairs, Housing and Sports of the State of Schleswig-Holstein commissioned Heckler & Koch Germany to manufacture and supply the HK437.