FX-05 Xiuhcoatl Mexican Assault Rifle

The FX-05 Xiuhcoatl is a Mexican assault rifle, designed and built by the Dirección General de Industria Militar del Ejército (General Bureau of the Army Military Industry). The rifle was officially presented in the military parade on September 16, 2006, in the hands of the Special Forces Airmobile Group, GAFE. (Grupo Aeromóvil de Fuerzas Especiales). The design was coordinated by the CIADTIM and SDN and all of its parts are built in Mexico. It is currently in use by the Mexican Army.

The design of the FX-05 Xiuhcoatl includes telescopic, red-dot and mechanical sights; cold-forged barrel; folding and adjustable butt stock; as well as the capability to semi-automatic, three round burst and full auto fire. The weapon can be chambered for the 5.56x45mm NATO or the 6.8x43mm SPC round. It has a cyclic rate of fire of 750 rounds per minute. Most of the rifle's receiver is constructed of a polymer reinforced with carbon-fibers with an underlying titanium frame and comes in black, dark-green and desert-tan colors as well as the SEDENA digital camouflage patterns used by the Mexican army.

The internal mechanism and barrel are made of advanced corrosion-resistant stainless steel. An Indigenous programmable air-burst grenade launcher is currently under development for the FX-05, which will be able to fire standard NATO munitions in addition to Mexico's new RSE-7 fuel-air grenade round but until it is finalized the FX-05 will use the AG36 grenade launcher as used on the G36. The FX-05 is one of the worlds few assault rifles featuring polygonal rifling, which eliminates the normal grooves of a weapons barrel replacing them with a system of "hills and valleys" in a rounded polygonal pattern.

FX-05 Xiuhcoatl
Type	Assault rifle
Place of origin	Mexico
Service history
In service	2008–present
Used by	Mexican Army
Production history
Designed	2005
Manufacturer	Dirección General de Industria Militar del Ejército
Produced	2005-present
Number built	Approx. 50,000
Variants	Assault rifle Carbine Light machine gun Sharpshooter
Specifications
Weight	3.89 kg (8.6 lb) (Assault rifle) 3.22 kg (7.1 lb) kg (Carbine) 4.23 kg (9.3 lb) (Light Machine Gun) 4.02 kg (8.9 lb) (Sharpshooter)
Length	1,087 mm (42.8 in) stock extended / 887 mm (34.9 in) stock folded Assault Rifle 980 mm (38.6 in) stock extended / 780 mm (30.7 in) mm stock folded Carbine 1,244 mm (49.0 in) stock extended / 1,044 mm (41.1 in) stock folded Light Machine Gun 1,204 mm (47.4 in) Sharpshooter
Width	56 mm (2.2 in)
Cartridge	5.56x45mm NATO
Action	Gas-operated, rotating bolt
Rate of fire	750 rounds/min cyclic
Muzzle velocity	956 m/s (3,136 ft/s)
Effective range	200–923 m sight adjustment
Feed system	30-round detachable box magazine
Sights	Iron sights Picatinny rail for mounting aiming optics on receiver