Feeds

New plastic telescope ammo machine gun is light as a rifle

Every soldier could get heavy-weapons firepower in future

Internet Security Threat Report 2014

The US Army has announced successful tests of a new, lightweight portable machine-gun which fires special plastic ammunition. The gun and ammo are so much lighter than current weapons and their brass-cased cartridges that some soldiers are suggesting that every infantryman could in future pack the sort of firepower reserved today for heavy-weapons specialists.

The new Lightweight Small Arms Technologies light machine gun (LSAT LMG) with cased telescoped ammo. Credit: US Army

The machine-gun that only weighs as much as a rifle.

"I could see a whole squad carrying it," said Specialist Brandon Smith of the US Army, having participated in the trials over the past two weeks. "You would own the battlefield."

Normally only two soldiers in each eight-man squad* carry a light machine gun (LMG, aka Squad Automatic Weapon or SAW). This shoots the same ammunition as the other troops' rifles, but it is normally fed from a long belt rather than a magazine with only 30 rounds, and the LMG is designed to be fired on full auto for sustained periods (though in short bursts only, or even its heavy barrel would soon fail due to overheating). The gunner carries a lot more ammo than his teammates, and they sometimes carry some extra for him too - the idea being that his heavy firepower will pin the enemy down in a fight, letting the others manoeuvre and win the battle.

The downside of this is that the machine-gun and its belt (nowadays generally packaged in a box fitted to the gun, to prevent it flapping about and being a pain) are heavy, so much so that the gunner is at a decided disadvantage in a close-up gunfight where he needs to aim and shoot quickly while standing up. And the total load of weapon plus lots of ammo is very heavy.

Thus most soldiers are armed with assault rifles not intended to deliver sustained automatic fire and holding less ammo. These lighter weapons are handier for close-in fighting and permit other kit to be carried.

But US military boffins at the famous Picatinny Arsenal have been working on this situation for some time. Since ammo weight and bulk is much of the problem, they have come up with a new kind of ammunition: Cased Telescoped cartridges.

In a cased telescoped round, the bullet is no longer attached to the tip of a brass case full of propellant powder. The new case is shorter, fatter and made of plastic, so weighing substantially less, and the bullet is sunk into the middle of the propellant which makes the whole round shorter - it has been "telescoped". A shorter round weighs less itself, and also means that the gun's action, feed equipment etc is smaller and thus lighter as well. It's a trick originally developed for tanks, to make the turret smaller and easier to protect.

According to the Picatinny scientists, their new LMG and a thousand rounds of its plastic-cased-telescoped ammo weigh no less than 20.4 pounds less than the current M249 (a version of which is also used by British troops) and a thousand ordinary 5.56mm brass cartridges. The new LMG shaves no less than 8.3 pounds off the 15.7-lb M249, coming in at just 7.4lb - actually lighter than a standard British SA80 assault rifle! This, perhaps, explains Specialist Smith's opinion that it would be reasonable for all soldiers to carry such weapons, rather than just heavy-weapons specialists.

Beginner's guide to SSL certificates

More from The Register

next story
WRISTJOB LOVE BONANZA: justWatch sex app promises blind date hookups
Mankind shuffles into the future, five fingers at a time
Every billionaire needs a PANZER TANK, right? STOP THERE, Paul Allen
Angry Microsoftie hauls auctioneers to court over stalled Pzkw. IV 'deal'
Apple's Mr Havisham: Tim Cook says dead Steve Jobs' office has remained untouched
'I literally think about him every day' says biz baron's old friend
Flaming drone batteries ground commercial flight before takeoff
Passenger had Something To Declare, instead fiddled while plane burned
Cops apologise for leaving EXPLOSIVES in suitcase at airport
'Canine training exercise' SNAFU sees woman take home booming baggage
Oi, London thief. We KNOW what you're doing - our PRECRIME system warned us
Aye, shipmate, it be just like that Minority Report
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
WIN a very cool portable ZX Spectrum
Win a one-off portable Spectrum built by legendary hardware hacker Ben Heck
Saudi Petroleum chooses Tegile storage solution
A storage solution that addresses company growth and performance for business-critical applications of caseware archive and search along with other key operational systems.
Protecting users from Firesheep and other Sidejacking attacks with SSL
Discussing the vulnerabilities inherent in Wi-Fi networks, and how using TLS/SSL for your entire site will assure security.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.