In 2008, a variant of the FN SCAR—the Heat Adaptive Modular Rifle (HAMR)—was one of four finalist rifles for the Infantry Automatic Rifle (IAR) competition. The IAR was a United States Marine Corps requirement for a lightweight automatic rifle for squad automatic rifle use. [31]

The M27 Infantry Automatic Rifle (IAR) is a 5.56mm, select-fire assault rifle / squad automatic weapon developed from the HK416 by Heckler & Koch.

Oct 26, 2010 · The FN SCAR IAR has been rebranded as the FN Heat Adaptive Modular Rifle (HAMR). This automatic rifle includes the clever IAR feature of firing from a closed bolt (increase accuracy) until it heats up to a certain temperature and transitions to a open bolt configuration (better air flow and cooling).

Dec 22, 2008 · Today FN offers the new Infantry Automatic Rifle (IAR), a unique, highly-adaptable, modular selective fire weapon system that fills the roles of both individual battle rifle and squad automatic weapon in one light, compact package.

Mar 5, 2022 · According to this power point, it uses something called a “phase change thermal actuator” attached to the hottest part of the barrel. The actuator then basically flips a switch in the fire control group to change from closed to open bolt operation.

The magazine-fed FN IAR is capable of firing from a closed bolt in both semi-automatic and fully-automatic modes, yet automatically transitions into open-bolt operation in semi-automatic or full-automatic before reaching cook-off temperature for a chambered cartridge.

The FN Heat Adaptive Modular Rifle (HAMR) is a prototype Belgian-American squad automatic weapon concept derived from the SCAR. Designed in 2008, the weapon was one of four finalists of the Infantry Automatic Rifle program although it eventually lost out to the M27 .

FN公司参与美国海军陆战队在2006年发起的IAR（单兵轻机枪）竞标的样枪是在原FN SCAR-L（Mk16）的基础上改进而成，包括采用重型枪管和自带两脚架，此外FN IAR最大的特色是具有两种发射方式：在半自动模式下为闭膛待击，在全自动模式下为开膛待击。 这样的目的是让射手既能够提供精确的半自动火力，而在全自动射击时又能加快冷却速度，避免由于膛内升温过高而导致的枪弹自燃或其他故障。 FN IAR 空枪重10.4磅，是入围样枪中重量最大的，但仍然在指 …

Mar 13, 2018 · Upon closer inspection of the weapon pictured, it appears that it is in fact a version of the 5.56x45mm NATO HAMR-16 (Heat Adaptive Modular Rifle) that FN America introduced into the Marine Corps’ IAR competition, now almost a decade old. There are three points that positively identify this weapon as a HAMR-16.

Dec 16, 2021 · WEAPON TYPE - Squad automatic weapon, Assault rifle. CALIBER - 5.56×45mm NATO. ACTION - Gas-operated (short-stroke piston), rotating bolt, combined closed-open bolt operation. LENGTH - 38.8 inches (99 centimetres) (stock extended) WEIGHT EMPTY - 11.2 pounds (5.1 kilograms) FEED SYSTEM - 30-round detachable box magazine. CYCLIC RATE - …