Fullbore Target Rifle (TR) is a precision rifle shooting sport governed by the International Confederation of Fullbore Rifle Associations (ICFRA). The sport evolved as a distinct British and Commonwealth of Nations discipline from Service rifle (SR) shooting in the late 1960s. Its development was heavily influenced by the British National Rifle Association (NRA). Due to this history, it is usually contested amongst the shooting events at the Commonwealth Games, although not at the Olympics. World Championships are held on a four-year cycle. The annual NRA Imperial Meeting at Bisley in the UK is globally recognised as a historic annual meeting for the discipline. Nordic fullbore rifle is a variation of arranged by the Scandinavian rifle associations including the National Rifle Association of Norway, DGI Shooting (formerly De Danske Skytteforeninger) and the Swedish Shooting Sport Federation (formerly Frivilliga Skytterörelsen). Nordic field shooting competitions are shot at varied distances out to 600 m. History Originally derived from service rifle, Target Rifle was shot with rifles of military origin, and the rules followed the adoption of cartridges by the military - from the .451 Whitworth rifle to the .303 Lee-Metford, and eventually to 7.62 NATO and .308. Modifications such as custom stocks and barrels became increasingly common but rifles were nonetheless built around actions of military design. In 1970, George Swenson and Laurie Ingram developed the Swing rifle as an alternative to the dominant designs of the day, which were built around the Lee-Enfield No. 4 and Mauser 1898. The Swing was one of the first actions designed explicitly for target shooting, with attention paid to a short lock time and clean trigger break. The Swing influenced the design of the RPA Quadlock. The 1970s also saw the development of the Mauser-influenced Musgrave Target Rifle in South Africa, with the Australian Barnard Model P action entering production in 1982. Equipment Standard rifle To level the playing field as much as possible without stifling progress, and to make it possible for riflemen of all budgets to compete seriously, the rifle or all its component parts must be 'readily available in quantity'. Sights Modern target rifles are extremely accurate, and have aperture sights which are fully adjustable for elevation and windage. They developed from the observation that the eye when viewing through a circular aperture will naturally centre the black circular target, on a white backing. Initially this was accomplished using a standard 'post' foresight