Oleg Zabluda's blog
Friday, July 20, 2018
 
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Army weapons officials recently awarded contracts to five firms to develop prototypes of the Next Generation Squad Automatic Rifle (NGSAR). It will have to be five pounds lighter than the full-size M249 it replaces and fire ammo that's lighter and more potent than the service's current 5.56mm round.
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One of the challenges facing manufacturers is the requirement for ammo that's more potent than the M855A1 5.56mm Enhanced Performance round and 20 percent lighter than traditional brass-cased ammunition. [...] M855A1 will not defeat enemy body armor plates similar to the U.S. military-issued Enhanced Small Arms Protective Insert, or ESAPI. The solution will likely be a cartridge that uses lighter material than brass for the casing.

Textron has been working for more than a decade on next-generation light machine guns that fire polymer case-telescoped ammunition in its Lightweight Small Arms Technology program.

Other companies have found that standard cartridge designs made completely from polymer are not strong enough and are prone to damage during the extraction process. One solution has been to use brass at the base and polymer for the majority of the case.
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https://www.military.com/kitup/2018/07/18/army-3-star-potent-new-auto-rifle-just-close-combat-troops.html
https://www.military.com/kitup/2018/07/18/army-3-star-potent-new-auto-rifle-just-close-combat-troops.html

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