Okay, now I'm confused. On these two points I've read many convincing arguments that: 1) 30-round mags are meant to hold 30 rounds and there's no need to under fill them to insure proper function, and: 2) The springs wear out faster by repeated emptying and filling of the mag, as opposed to leaving them loaded. I've lately been reading the US Marine Corps Rifle Marksmanship manual and the following are excerpts pertaining to these two points: 1) "The recommended number of rounds per magazine is no more than 29. Thirty rounds in the magazine can prohibit the magazine from seating properly on a closed bolt." 2) "Ammunition in filled magazines should be rotated frequently if the rounds are not expended. The spring tension on the magazine can weaken if compressed for a long period of time and can cause a malfunction of the magazine." Hard to imagine the Marines have it all wrong...
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