The Mk 16 Mod 0 SCAR-L will be replacing the M4A1. It is effective at ranges of 150 meters (160 yd) or less and has a maximum effective range of about 500 to 600 meters (550–660 yd). Although the M4 has less effective range than the longer M16, many military analysts consider engagement with a non-specialized small arm above a range of 300 meters (330 yards) to be unnecessary. The M4A1 is especially favored by counter-terrorist and special forces units for close quarters combat because of the carbine's compactness and firepower. The M4A1 is used by almost all U.S special operation units. The M4A1 has a S/1/F (Safe, Semi-Automatic, Full Automatic) trigger group, while the standard M4 Carbine has a S/1/B (Safe, Semi-Automatic, 3 Round Burst) trigger group. The M4A1 carbine is a fully-automatic variant of the basic M4 carbine intended for special operations use. A separate sighting system is added to rifles fitted with the M203, as the rifle's standard sights are not matched to the launcher. The rifle magazine functions as a hand grip when firing the M203. The device attaches under the barrel and forward of the magazine, the trigger being just forward of the rifle magazine. military, when a rifle or carbine is equipped with the launcher, both weapons are collectively referred to as an M203. Attachment: M203 Grenade Launcher- The M203 is a single shot 40 mm grenade launcher that attaches to many rifles, but was originally designed for the U.S. The M16A4 retains its predecessor's semi-automatic and burst fire modes. Army Field Manuals, M16A4s fitted with the RAS are sometimes referred to as the M16A4 MWS, or Modular Weapon System. The M16A4 also adds a backup iron sight and is equipped with a Knight's Armament Company (KAC) M5 RAS handguard, allowing vertical grips, lasers, tactical lights, and other combat accessories to be attached. Army units, replaces the combination fixed carry handle/rear iron sight with a MIL-STD-1913 rail, in order to provide a standardizing mounting platform allowing for the rifle to be equipped with a carry handle and/or most military and consumer scopes or sighting systems. The M16A4, now standard issue for front-line U.S. Weapons of Dragon Rising Assault Rifles M16A4
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