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85 Spike LR received in 2017 and 2018, for the reconnaissance forces (transported by the Luchtmobiel Speciaal Voertuig and the Fennek reconnaissance vehicle), using the existing launchers. [162] Spike LR2 and iCLU launchers approved by the parliament in September 2024, to be ordered in October 2024 and enter service in 2026. [163]
In most automatic firearms that use delayed blowback, recoil, or gas operation, the bolt itself is housed within the larger bolt carrier group (BCG), which contains additional parts that receives rearward push from a gas tube (direct impingement) or a gas piston (short-stroke or long-stroke piston) system.
The weapon's spring extractor is installed inside the bolt head and enclosed in one of the locking lugs while the ejector is a fixed protrusion of the internal bolt carrier guide rail. The firearm uses a hammer-type firing mechanism and a trigger group that enables semi-automatic and fully automatic firing modes. The fire selector switch, which ...
The operating rod is connected to the bolt carrier group and rides through a machined boss in the receiver rail system interface, keeping the bolt carrier in a linear plane as it operates. This eliminates carrier tilt. A spring-loaded dust shield mounted on the bolt carrier allows the bolt carrier to return to ready position.
Like the G3 and HK33 assault rifle bolts the HK21 bolt features an anti-bounce mechanism that prevents the bolt from bouncing off the barrel's breech surface. The "bolt head locking lever" is a spring-loaded claw mounted on the bolt carrier that grabs the bolt head as the bolt carrier group goes into battery.
The rebated rim dimensions exactly match the 6.8mm Remington SPC case, allowing the use of the 6.8mm SPC bolt-face of an AR-15, but the case has a base diameter of .4400" and cannot be reformed from any other existing case. The 400 LGND uses .4005" jacketed rifle bullets. 450 Bushmaster, Uses .284 Winchester cases. Cut the length to 1.700" to ...
The bolt is a seven-lug rotating type, which sits in a bolt carrier and operates in a forged alloy receiver resembling those of the Stoner-designed AR-10, AR-15 and M16 rifles. Like the HK416, the HK417 is gas-operated with a short-stroke piston design similar to that of the Heckler & Koch G36 .
The feature that grants the weapon its low recoil (compared to similar light machine guns) is the "constant recoil" principle. The overall design allows the bolt carrier group to travel all the way back without ever impacting the rear, instead stopping gradually along the axis of movement against the resistance of the return springs.