Abstract: An indicator for use on a rifle to indicate from a distance that the bolt of the rifle is open, the rifle having a charging handle and a receiver, and comprising in combination a body having two forwardly extending upright rails which are laterally spaced apart; a forwardly extending base integral with the rails and from which the two rails depend; an indicator flag integral with the base and upstanding therefrom; the rails having forward ends configured for interfit with the receiver, and having rearward ends configured for interfit with the charging handle, whereby the flag projects visibly upwardly relative to charging handle and receiver.

Abstract: An arrow having an axially elongated shaft including a mandrel at the forward end of the shaft, a blade unit, comprising a generally axially extending tubular body, and blades on and projecting outwardly from the body, the body being telescopically slidable on the shaft; and structure on the body to releasably axially retain the body to the mandrel during airborne flight of the arrow, and to release the body for axial rearward sliding on the shaft in response to penetration of the mandrel into a target.