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In addition
Load you mag to capacity and leave it in a cupboard for a few years and the magazine spring will experience permanent spring set
providing a total of 17 rounds
The result is the steel insert protects the magazine lips
The mag is still pithing proportion though
Magpul M3 magazine 30 round (AR-15) 13 In additionThe next generation PMAG 30 GEN M3 is a 30 round 5. 56x45 NATO (. 223 Remington) polymer magazine for AR15 M4 compatible weapons. Along with expanded feature set and compatibility, the GEN M3 incorporates new material technology and manufacturing processes for enhanced strength, durability, and reliability to exceed rigorous military performance specifications. Similar to the MOE PMAG, the GEN M3 features a long life USGI spec stainless steel spring,
