The M99 is a new product launched by Barrett Corporation in 1999. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 The infoM99's rotary pull-back bolt was redesigned, as was the barrel, the .50 barrel that Barrett had previously designed was 29 inches long, but the M99's barrel was increased to 33 inches, and no further grooves were made on the barrel surface in order to increase the barrel weight to maximize accuracy at long ranges. There is a RIS rail on the top of the receiver for mounting various scopes. The M99 did not have a magazine, and Barrett designed the single-shot gun to provide an unprecedented high-precision .50 sniper rifle.

Fold Barrett XM109/PayloadRifle

http://baike.so.com/doc/6146204.html

Barrett XM109/PayloadRif

Barrett XM109/PayloadRif

In 2002, Barrett introduced the latest modification of the M82A1, the 25mm Pelaud rifle. Note that although its official name is "Rifle", in fact it is a semi-automatic grenade launcher that can be carried and combated by individual soldiers. The 4-round capacity magazine, since the length of the 25mm ammunition is shorter than the .50BMG, there is an unused compartment at the front end of the magazine, so that the length of the 25mm magazine is maintained, so that the modification of the "Pelaud" does not need to change the lower receiver

Barrett had the idea of developing a grenade launcher very early. When Russia unveiled the 30mm AGS-17 automatic grenade launcher, Barrett realized that the .50 caliber M82A1 could also be converted into such a weapon, but unfortunately the United States did not have the corresponding ammunition available at that time, so this plan had to be shelved. Until recently, Barrett discovered that the 25×59Bmm munition developed by the U.S. Army for the Ideal Squad Weapon (OCSW) program was ideal to meet the requirements of the program, and the U.S. Special Operations Department was also seeking an improved weapon to destroy some light vehicles, communications facilities, squad weapons, and ground-parked aircraft. The Barrett M82A1 rifle basically meets the requirements, but it needs to use explosive ammunition to meet the military's requirements for increased destruction.

Rather than designing an entirely new weapon to meet the munitions needs, Barrett began to design a conversion device that would adapt the M82A1M's lower receiver to 25mm ammunition with minimal modifications to the existing Army M82A1M. The "Pelauder" rifle was produced from the factory in just two months.

The actual work is not as simple as it sounds, since the recoil of firing 25×59Bmm ammunition is significantly greater than that of firing .50BMG shells. However, Barrett decided to make small improvements to the M82A1 lower receiver so that the recoil system of the new weapon could be used in conjunction with the newly developed conversion device, and the newly designed muzzle brake effectively reduced the recoil force.

In addition, bolt speed is critical for any semi-automatic or automatic weapon, affecting every component of the recoil system. The M82A1 bolt has a speed of 6.35 m/s, and its recessing spring is designed for this speed. Therefore, the bolt speed of the "Pelaud" had to be maintained at the level of the M82A1 rifle. Bolt velocity also affects shelling and ejection in some cases, and if the speed is too fast and the shelling is too abrupt, the bottom of the cartridge case may be pulled off. To solve this problem, Barrett installed two additional barrel return springs and two hydraulic shock absorbers in the conversion unit. When the barrel recoil is almost in place, these devices transmit movement to the receiver. The shock absorber reduces the speed of bolt movement to a reasonable level, and while the speed of the cartridge plate is still slightly higher than that of the M82A1 rifle, the movement of the barrel is reduced to a level that allows for smooth shelling.

Fold the Barrett XM500

http://baike.so.com/doc/3428544.html

Barrett XM500

Barrett XM500

Caliber: .50BMG (12.7×99mm)

Principle: barrel recoil, semi-automatic

Overall length: 1168 mm (45.98 inches)

Barrel Chief: No information available

Barrel wrap 381mm

Magazine: 10 rounds

Weight: 11.8 kg (26 lbs) (without bullets)

Muzzle velocity: 900m/s (2953f/s)

Effective Range: 1,850 m (2,023.18 yd)

Maximum Range: 6,800 m (7,436.57 yd)

Ammunition feeding method: 10 rounds Barrett M82 detachable magazine

Sight: A sight or night vision goggle is mounted on a tactical rail at the top of the receiver

overview

It is a .50 caliber sniper rifle based on the Barrett M82/M107 heavy sniper rifle. The aim is to be a lighter and more compact alternative to the M82. Since the XM500 is fitted with a fixed barrel (instead of the recoiled barrel design of the M82), it is likely that it will be more accurate as a result. Like its predecessor, it is fitted with a foldable and detachable bipod mounted below the handguard. Due to the lack of a crosshair (mechanical sight), it is necessary to mount a scope and/or night vision goggles/other tactical accessories on the tactical rail on the top of the receiver. However, the XM500 has not appeared again except after it was exhibited in 2006, and may not have been developed and tested yet.

Due to the calf-like construction, the 10-round detachable magazine from the M82 is fed by mounting behind the trigger.

The calf (also known as the calf or stockless structure) is a design of firearms that is more commonly found on rifles. The stockless structure changes the position of the magazine and receiver to the butt behind the trigger (hence the name "magazine rear gun" or "rear magazine gun"). The M82 is a pneumatic semi-automatic firearm with a barrel that is retracted (approximately 1 inch 25mm) at a short distance and secured by a rotary bolt when fired. After a brief retreat, the bolt is pushed into the bending rail and then twisted to unlock the barrel. When the bolt is unlocked, the bolt pull arm instantly retreats, and the barrel transfers the recoil to complete the cycle. The barrel is then fixed and the bolt springs back, ejecting the cartridge case. When the firing pin is homed, the bolt pulls a bullet out of the magazine and into the chamber to align it with the barrel. The trigger springs back to the position behind the firing pin. The magazine of this gun can hold 10 rounds at a time, although there are also 12 magazines, but they have not been produced after the First Gulf War.