Making the Case for Polymer Rifle Cartridges

True Velocity developed a lighter and more efficient cartridge case for the military so personnel can carry more rounds at the same weight.
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Concept for self manufactured cartridge cases using hydroforming : r/DIYGuns

GD-OTS' RM277 automatic rifle variant, aiming to replace both M4 and M249. Chambered in .277 TVCM, a 6.8mm cartridge with a polymer case. : r/ForgottenWeapons

PCP Ammuntion Polymer-Cased (Plastic-Cased) Ammo Goes Prime Time at SHOT Show 2012 Media Day: Ultra-Lightweight Rifle/Machine Gun Ammo is Combat Ready! (Video!) – (DR): An online tactical technology and military defense

What are the components of a firearms cartridge and what happens to them when a gun is fired? - Quora

How to make ammo cartridge casings from scratch - Quora

Would it be possible to make a cartridge casing made of PLA or TPU plastic? - Quora

PCP Polymer Cased Rifle Ammunition -The Firearm Blog

Lead-Free Hunting Bullets - Guns and Ammo

Polymer ammo: A lightweight approach to support the warfighter > Marine Corps Systems Command > News Article Display

Would it be possible to make a cartridge casing made of PLA or TPU plastic? - Quora