Breech-screw

A screw composed of a body, tenon and ti (. employed to close the bottom of the bore. The screw mte fits into the thread cut in the breech-piece, and is woi forward or backward by the lever and tappet so as to p … home or release the vent-piece. … ree oh-sight. — A device attached to the breech of a fine to guide the marksman in conjunction with, the frdnt-d i … when aiming. …