Abstract: A kinetic energy enhancing penetrator assembly for use with an archery arrow comprises a weighted arrow insert and a resilient member. The weighted arrow insert includes a semi-cylindrical body and a base extending from the body for releasable engagement with a nock of the arrow. The weighted arrow insert additionally includes a tapered head for engagement with the resilient member. The weighted arrow insert includes a feature enabling passage of air thereby reducing compression of air entrapped within a bore of an arrow shaft and any resulting resistance. The resilient member includes a coil spring affixed to a rear end of the insert for buffering impact of the weighted arrow insert against an arrowhead of the arrow. In use, the penetrator assembly within an arrow applies a secondary burst of kinetic energy upon the arrowhead upon impact with a target.