Extreme Impact Resistance-won't crack or break when dropped. Very resistant to harsh chemicals. Superior heat, cold and UV resistance-won't become brittle over time even when exposed to harsh environments or extreme cold.
Magpul PMAG, Gen M3, .223 Rem/5.56 NATO, 40RD Black Magazine
Along with expanded feature set and compatibility, the PMAG 40 AR/M4 Gen M3 incorporates new material technology and manufacturing processes for enhanced strength, durability, and reliability to exceed rigorous military performance specifications.