The ruger is heading back to the factory today. It will not consistently feed. There is a small metal lip in the top rear of the mag well that is catching the rim of the case and not allowing it to feed up enough for the bolt to catch and strip the rounds out. With plastic mags The back wall is thick enough that the rounds pass infront of this lip. But I find the plastic mags are to flimsy to be counted on in a High risk scenario.