Ordnance 105mm IWS A development by Royal Ordnance designated Improved Weapon System with an increased chamber pressure and a longer barrel length of L/63.4. FM K.4 Modelo 1L Argentine Army's licence produced by Fabricaciones Militares in Argentina. Used on the TAM medium tank. Also designated as "105 mm FRT L51 Tank Gun". Chinese models Type 79/81/81A/83 Chinese produced L7. Licence procured from Austria. ZPL-79 Chinese licence-built designation for the L7A3 with replaceable indigenous thermal sleeve. Also known as Type 79. It was mounted on the Type 80 tank prototypes. ZPL-81/A Modified Type 79. ZPL-81A has improved thermal sleeve. First seen on the Type 59-II tank. ZPL-83/A Modified Type 81 with longer barrel and improved construct material. Also known as Type 83. It was fitted on the Type 59D1, Type 63HG, Type 79 tank and Type 88B tank. ZPL-94 Modified Type 83 with longer barrel at 62 caliber. Mounted on Type 59D tank and Type 88A tank. ZPL-98 Modified Type 83A rifled gun with an indigenous low recoil muzzle brake and lighter weight. It was mounted on the Type 63A amphibious tank. Also known as Type 98 rifled gun. ZPL-98A Modified Type 98 rifled gun, mounted on ZTD-05 and ZTL-11. Other developments GT-3 South African variant built by Denel for converting Centurion with 20-pounder gun into Olifant tanks. GT-3 retained the breach assemblies of 20-pounder paired with the modified copy of L7 barrel. GT-7 South African variant built by Denel for the Olifant Mk1A and Rooikat 105. Incorporates a heavily modified recoil assembly. Rheinmetall Rh-105 family Multiple variants of 105 mm tank gun developed from L7 by Rheinmetall of Germany for commercial market. The family consisted of Rh 105-60, Rh 105-40, Rh 105-30, Rh 105-20, and Rh 105-11. The last two numbers on the designation denotes the gun recoil force in metric ton. The Rh 105-20 and -11 models were fitted with muzzle brake and intended to be mounted on light tanks and wheeled armored vehicles. The variants has been fitted as modification on various armored vehicles, such as Rh 105-30 on Spanish M47E2, Rh 105-20 on Ikv 91 and AMX-10 RC, and Rh 105-11 on MOWAG Shark. L74 Swedish model built by Bofors for the Strv 103 using more sophisticated recoil assembly and a longer L/62 gun tube for increased muzzle-velocity and accuracy. Usage L7 variant Centurion: L7A1 cannon on late Centurion models and derivatives such as Olifant Vickers MBT: