The Raven TopStop upper receiver cover provides essential protection for AR-15 and M4 type upper receivers when detached from the lower receiver. This yellow polymer cover snaps securely in place to completely seal the upper receiver.Raven TopStop Upper Receiver CoverDesigned for AR-15 and M4 type upper receiversSnap-on design for easy installationComplete sealing prevents fouling ingress and egressRetains bolt carrier group and charging handle during transportTough polymer construction with matte yellow finishOnly fits uppers detached from lower receiversEssential for gunsmiths armorers and enthusiasts who need to transport or store upper receivers separately while maintaining cleanliness and component retention.