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Colt M16A4 Rifle, now in production, features a performance identical to the M16A2. Physical differences between the two weapons include a removable carrying handle with an integral rail-mounting system on the M16A4. When the carrying handle is removed, any accessory device with a rail grabber, such as an optical sight, can be mounted on the weapon. The M16A4 Rifle barrel is designed to accept the M203 Grenade Launcher which can easily be assembled to the rifle offering the user both point and area firing capabilities. Also, all US and NATO rifle grenades can be fired without any supplementary equipment. The new concepts of rapid deployment, mobility and increased firepower play a major part in the overall strategy of modern warfare. Increased emphasis is now put on small tactical units that are able to “get in and out” fast. Increased need for a lightweight, highly dependable, accurate service rifle with added fire power therefore exists. Colt M16A4 Rifle is the ultimate rifle in 5.56mm.
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Mechanically, the Famas G2 is the same as the in-service Famas F1 and is chambered for the standard 5.56 × 45 mm cartridge. However, the standard rifling is one turn in 228 mm, allowing it to be used with M193 or SS109 types of ammunition. Optionally, the barrel can be rifled one turn in 178 mm or one turn in 305 mm to suit specific requirements.The outline has changed by the adoption of a full-hand trigger guard, allowing the rifle to be fired when wearing Nuclear, Biological and Chemical (NBC) protective or arctic mittens or heavy gloves. The breech-block buffer has been reinforced so as to better withstand the firing of rifle grenades, and the magazine housing now conforms to NATO Stanag 4179 and accepts all M16-type magazines, straight or curved, metal or plastic.The selector lever/safety catch is now placed inside the trigger guard, and the front end of the handguard has been given a downwards lip to prevent the hand from sliding forwards onto a hot barrel.Other Famas G2 features include the provision of a NATO sight base to allow the fitting of optical day or night sights. A bipod can be fitted, and there is provision for mounting a bayonet over or under the muzzle. It is also possible to install a 40 mm grenade launcher. The ambidextrous features of the Famas F1 were carried over to the Famas G2.