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This 9mm Upper 80% Lower Set comes raw "in the white" and is ready to be Anodized, Cerakoted or plated80% Lower Features:This New Frontier 9mm AR15 lower receiver accepts glock pattern or style magazines. With Glock pattern 9mm AR15 builds, the last round bolt hold open (LBHO) is featured in the 9mm upper receiver. Further machining is needed to make the lower receiver operational.