The upper receiver is machined from 7000 series aluminum alloy and has a clean, lightweight and robust design. The Pen&Fun&www.biquge.info lower receiver is made of 7075 series aluminum alloy and is fitted with a pistol grip of the M4 carbine for a natural and comfortable grip that reduces fatigue and maximizes control of the adjustable trigger. The bolt is equipped with a self-lubricating polymer bolt sleeve to ensure smooth operation of the bolt and prevent dust from entering the bolt. There are 9 locking protrusions at the front end of the bolt, arranged in 3 rows. When locking, the bolt is combined with the locking groove of the barrel sleeve. The opening and closing angle of the bolt is 60°, and the operability is good. The round head of the pull handle is made of polymer material and has a large size design, which makes it easy for the shooter to operate even with gloves.

The adjustable trigger can be removed and installed even without tools. The trigger guard has a widened design to facilitate the shooter to operate the trigger with gloves. The 10-round magazine is made of lightweight, durable polymer. The magazine jam is set in front of the trigger retainer, which is convenient for left and right hand operation. The manual safety is designed with the M4/M16 rifle and is located above the grip and can be manually changed to either side of the receiver according to the shooter's habitual use, making it easy to operate, even if the shooter holds the grip and the face is close to the cheekplate. The bumper is safe when placed underneath, and can be adjusted to launchable by simply dialing it up 45°.

Advantage 3: Extended guide rail

A 457mm long Picatinny rail is mounted above the aluminium casing, which can be used to install night vision devices, laser pointers and other optical devices. If the length of such a guide rail still does not meet the demand, an additional casing with a guide rail on the top can also be installed at the front end of the casing, and the guide rail can be extended by another 152mm to install some special devices, such as the front end of the M98B casing in the title figure of this article is equipped with an additional casing with a guide rail. In addition, there are rails on the left and right sides of the front of the receiver and under the receiver for additional accessories.

Advantage 4: Easy to clean and cool

Grooves are engraved in the competition-grade barrel that effectively reduce the mass of the whole gun while also helping to cool the barrel during continuous firing. The ejection window is relatively wide, so it is easy to clean the chamber. In addition, there is a set of heat dissipation holes machined in front of the upper receiver to cool the barrel.

Advantage five: two-hole muzzle brake

The gun is fitted with a specially designed high-efficiency two-hole jaw brake that reduces most of the recoil. In addition, the design of the bipod and the rubber cushion of the butt makes the recoil of the gun very soft.

Advantage 6: Equipped with a scope system

In order to further enhance the accuracy when firing, the Barrett company equipped the gun with a sight with a BORS (Barrett Optical RangingSystem) sighting system. The sight was designed by Barrett on the basis of the Leopold MKIV. sight. It is equipped with a ballistic calculation system, which allows the correction data to be calculated according to the direction of fire, ambient temperature, humidity, etc.

Shooting sensations

When firing with the M98B rifle in good weather conditions, the diameter of the dispersion circle at a distance of 500m is about 60mm - this means that if you can see the upper body of the enemy when shooting at 1600m, you will inevitably be shot. Such high accuracy is enough for professional snipers.

The innovative design and excellent long-range sniper ability make the M98B sniper rifle even more attractive. Whether it is the military and police field or civilian projects such as hunting and long-range shooting competitions, the M98B can cope with it.

Folding Barrett M99

http://baike.so.com/doc/5567134.html

Overall length: 1280 mm (50.4 inches)

Barrel length 838 mm (33 in)

The gun weighed 12 kg (26.6 lbs) and the gun used 12.7×99mm large-caliber Browning machine gun rounds, and could also fire other machine gun rounds of the same caliber if necessary.

Magazine capacity 10 rounds

M99 is a new product launched by Barrett in 1999, also known as BIGSHOT, which means "powerful and kills with one shot". The M99's rotary pull-back bolt was redesigned, as was the barrel, the .50 barrel designed by Barrett 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. It is generally believed that the sniper rifle used in the battlefield is within 300 meters, which has low requirements for accuracy and high rate of fire. In urban street fighting, semi-automatic and fully automatic are the best options. The semi-automatic mode means that the ammunition can be automatically loaded after being fired, and the trigger can be re-pulled to achieve the launch. The non-automatic mode means that after firing a bullet, you need to pull the bolt up and backward to unlock, manually remove the cartridge case and manually reload the second bullet, and then reset the bolt forward and down to lock and wait for the fire. There are more moving parts in the semi-automatic mode than in the non-automatic mode, and there are more factors that affect the stability of the shot, so it is easy to affect the shooting accuracy. The tactical idea of a sniper rifle emphasizes the first hit!

Domestic version

China's M99 semi-automatic sniper rifle is a newly finalized export anti-materiel rifle, when the gun first appeared, it is easy to make people think that it has a deep relationship with the British M99 sniper rifle country AI company's AS50, the shape of the two seems to be very close, both are air-blown principles, especially the air duct has a heat shield outside the protection, to prevent the air duct from heating the air above and affecting the aiming. But if you compare carefully, you will find that the M99 and AS50 are only partially similar, and there are many actual distinguishable external features, and there are even more differences in the internal structure, just like the AK47 and Vz58. The interior of the M99 resembles an enlarged M16, with a rotary bolt locking; The AS50, on the other hand, is like an enlarged FAL or SKS, with offset latching to reduce the radial size. The receiver of the M99 appears to be thicker than that of the AS50, but this is due to the fact that the airtrain is extended backwards to prevent gas contamination of the bolt, and the upper part of the bolt frame is increased to wrap around the end of the duct and not be exposed throughout the bolt stroke, which is why the back of the receiver appears high. In addition, the receiver is a large piece of aluminum alloy cold-worked, and the volume is necessarily larger, but in terms of weight, the M99 is 2kg lighter than the AS50. [1]