The new and improved AR-STONER magazine for the 6mm ARC features a stronger stainless steel body for longer service life than the typical standard aluminum bodied magazine. The enhanced 4-way anti-tilt follower and chrome silicon spring provide reliable feeding even after extended storage and use. Made to military specifications, the AR-STONER magazine can be counted on at the range or in the field. Note: The 5 round magazine is the same physical size as the 10 round magazine. Features:6mm ARCStainless Steel BodyPolymer Anti-Tilt FollowerChrome Silicon SpringTeflon Black Finish