The Giat Industries 105 mm G1 is a further development of the Giat Industries 105 mm CN 105/57 which is installed in the French FL-12 turret of the Giat Industries AMX-13 light tank and the Austrian Steyr-Daimler-Puch SK105 tank destroyer/light tank.

The modification enables the weapon to fire the 105 mm 105 G1A APFSDS ammunition. This uses the same projectile as that of the 105 mm rounds fired by the French Giat Industries AMX-30 MBT but uses a smaller cartridge case which gives a different muzzle velocity.

The ordnance is fitted with a single-baffle muzzle brake, thermal sleeve, fume extractor and semiautomatic horizontal breech mechanism.

As production of the Steyr-Daimler-Puch SK 105 tank destroyer/light tank has been completed, only replacement guns are now built. Production of this gun is undertaken at Giat Industries Bourges facility.

Production as required. Fitted to Steyr-Daimler-Puch SK 105 tank destroyer/light tank and Giat Industries AMX-13 light tank.