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Message: <blockquote data-quote="Defcon Shooter" data-source="post: 2979391" data-attributes="member: 42229"><p>The problem with steel ammo in 5.56 is the whole deminsions of the cartridge. The lack of taper to the case body is compounded by the lack of strong extraction on Stoner rifles. Just compare a 7.62x39 case to a 5.56x45 the tiniest bit of primary extraction has the combloc round free. Not true in the 5.56. Combine that with all the goo on steel cases to prevent rust and you have a formula for torn extractors and ruined chambers. That's why in 5.56 use the case material uncle sugar uses</p></blockquote><p></p>