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A407 100mm anti-tank gun M1977 A407 blueprint Type Anti-tank gun Place of origin  Romania Service history In service 1975-present Production history Manufacturer Arsenal Reşiţa Specifications Weight 3,150 kg (6,900 lb) Length 9.250 m Barrel length 4.630 m Width 2.250 m Height 1.530 m Crew 8 Caliber 100 millimetres (3.9 in) Elevation −5°/+37° Traverse 27°30' left and right Rate of fire 7 to 15 rounds per minute Muzzle velocity 900 m/s for HE 1400 m/s for APFSDS-T Effective range 1.040 m for AP 1.728 m for APFSDS-T Maximum range 20.600 m (HE) 4.000 m (AP) 3.000 m (HEAT) Sights mechanical sight, panoramic sight, optical sight, collimator The A407 100mm anti-tank gun M1977 is a Romanian rifled 100-mm anti-tank gun which serves as the main towed anti-tank gun of the Romanian Land Forces from 1975 until present. Versions of the M1977 gun were installed on main battle tanks (TR-77 and TR-85) and ship turrets. Contents 1 History 2 Variants 3 Operators 4 See also 5 References 6 External links History The A407 100mm anti-tank gun was the first artillery piece designed in Romania after World War II. The first variant of the gun, the M1975 (M stands for Model) had a semi-automatic horizontal sliding wedge type breech lock. The second variant, M1977, had a more practical vertical sliding wedge breech block.[1] The M1977 can be also used as a field gun at brigade level, as it has a maximum range of 20,6 kilometers. After 1992, the M1977 anti-tank guns were modernized with improved optical sights.[2] The gun can be towed with the DAC 665T truck and has a maximum road speed of 60 km/h on road and 30 km/h off-road. Variants M1975 - used the horizontal sliding wedge breech lock. M1977 - used the vertical sliding wedge breech lock. M2002 - modernized version of M1977 with a FCS TAT-100.[3] Adaptations:[4] A 308 - tank gun used for TR-77 and TR-85 main battle tanks. A 430 - 100 mm gun used for ship turrets. Operators  Romania - 208 M1977 towed anti-tank guns in 2010.[5]  Israel - one was delivered in 1993.[6] See also D-10 tank gun 100 mm field gun M1944 (BS-3) References Citations ^ Stroea A., page 146 ^ Stroea. A, page 148 ^ ROMARM description of M2002 ^ Stroea A., page 147 ^ IISS Military Balance 2010 ^ UN Disarmament Bibliography Foss, Christopher F. (2005). Jane's Armour and Artillery 2005-2006. Jane's Information Group. ISBN 9780710626868.  Stroea, Adrian; Băjenaru, Gheorghe (2010) (in Romanian). Artileria română în date și imagini (Romanian artillery in data and images). Editura Centrului Tehnic-Editorial al Armatei. ISBN 978-606-524-080-3.  External links Arsenal Reşiţa website Video Video of the M1977 firing on YouTube