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Each M27 link consists of a single piece of metal curved into two partial cylinders, into which adjacent rounds slide. Like the M13 link, the M27 link is a push-through design. Rounds are extracted by pushing forward out of the link. With the round freed, the link disintegrates (detaches from the belt) and is ejected.
An M27 disintegrating belt loaded with 5.56×45mm NATO M855 Ball and M856 tracer ammunition being fed into an M249 light machine gun Many modern ammunition belts use disintegrating links. Disintegrating links retain a single round and are articulated with the round ahead of it in the belt.
The M27 Infantry Automatic Rifle (IAR) is a 5.56mm, select-fire assault rifle / squad automatic weapon developed from the HK416 by Heckler & Koch. It is used by the United States Marine Corps (USMC) and was originally intended for automatic riflemen , [ 6 ] but now is issued to all infantry riflemen as a replacement for the M4 carbine .
The basic infantry weapon of the United States Marine Corps is the M27 Infantry Automatic Rifle. Suppressive fire is provided by the M240B machine gun, at the squad and company levels respectively. In addition, indirect fire is provided by the M320 grenade launcher in fireteams, M224A1 60 mm mortar in companies, and M252 81 mm mortar in battalions.
M27 Mosin–Nagant, a Finnish rifle; M27 Infantry Automatic Rifle, a squad automatic weapon developed for the U.S. Marine Corps; M27 link, a disintegrating 5.56×45mm NATO bullet link used in belt fed firearms; M.27 (mountain gun), a Norwegian mountain gun used in World War II; M27 tank, a rejected US World War II medium tank design
When in the belt-fed role, the weapon would feed from a disintegrating metallic linked belt marked "S-63 BRW" which is a scaled-down version of the U.S. M13 link developed for the M60 GPMG. The Stoner 63/63A will not work reliably with the later M27 link developed for the M249 SAW.
The M13 link replaced the older M1 links designed for .30-06 Springfield ammunition, which bound cartridges to each other at the neck, used on the older M1917 Browning machine gun and M1919 Browning machine gun family, though some conversions of the M1919 to the M13 were done, such as on the U.S. Navy Mark 21 Mod 0 machine gun, which saw service in the Vietnam War.
A metal M1 link was later adopted, forming a "disintegrating" belt. Loading was accomplished by inserting the pull tab on the ammunition belt from the left side of the gun—either metal links or metal tab on cloth belts—until the feeding pawl at the entrance of the feed way engaged the first round in the belt and held it in place.