Grendel magazines

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I purchased about a dozen magazines when I initially purchased/built my rifle. I tested each one to see if it would drop free when empty. Although all were made by C Products, some even from one source, only about half would readily drop free without some assistance from the operator. My opinion is that the coating on these stainless steel magazines varies in thickness and lubricity (how slick they are) quite a bit and that some of the magazines are coated too thickly. This is only a matter of a few thousandths of an inch and as the mags are used will eventually cease to be a problem as the finish wears off at contact points.