The 2A45M was created in the late 1980s at the Petrov Design Bureau at Artillery Plant Number 9 also responsible for the 122 mm howitzer 2A18 (D-30).
The most distinctive feature of the Sprut-B is its integrated engine, which can propel the gun on relatively flat surfaces (up to 15 degrees slope) and at 14 km/h on roads. This gives the gun a measure of mobility on the battle field. It takes 2 minutes to go from firing position to travelling position and 1.5 minutes to go from travelling position to firing position. Such guns are known in Russian as "self-moving" (самодвижущиеся) as opposed to self-propelled (самоходные), and outside of battle it is towed by an MT-LB.
The gun features a crew of seven. During the day the OP4M-48A direct fire sight is used, at night the 1PN53-1 night vision sight is used. For indirect fire the 2Ts33 iron sights are used, along with the PG-1m panoramic sight. The gun can reliably engage targets 2 metres high at a distance of 2000 metres.
With an additional piece of equipment of the 9S53, laser guided projectiles like the 9M119 Svir or 9K120 Refleks can be fired.
General characteristics (Sprut-B)
- Calibre: 125 mm, 51 calibre
- Muzzle brake: double `T' type
- Breech mechanism: semi-automatic, vertical wedge
- Shield: yes
- (towing) 6,500 kg (14,300 lb)
- (self-propelled) 6,800 kg (15,000 lb)
- (firing) 6,575 kg (14,495 lb)
- (towing) 7.120 m (23.35 ft)
- (self-propelled) 6.790 m (22.27 ft)
- (towing) 2.09 m (6.85 ft)
- (self-propelled) 2.35 m (7.70 ft)
- (towing) 2.66 m (8.72 ft)
- (self-propelled) 2.66 m (8.72 ft)
- Axis of bore: 0.925 m (3 ft)
- Track: 2.20 m (7.21 ft)
- Ground clearance: 0.36 m (1.18 ft)
- Elevation/depression: +25°/−6°
- Traverse: 360°
- (APFSDS) 2,000 m (2,200 yd)
- (missile) 5,000 m (5,500 yd)
- (HE) 12,200 m (13,300 yd)
- Rate of fire: 6–8 rds/min
- Fording: 0.9 m (3 ft)
- (in APU mode) 14 km/h (9 mph)
- (in APU mode) 50 km (30 mi)
- Crew: 7
- Towing vehicle: Ural-4320 (6 × 6) truck, MT-LB multipurpose tracked vehicle
- Towing speed: 80 km/h (50 mph)
- Sprut-A 2A45 Pure towed gun.
- Sprut-B 2A45M Self-propelled towed gun.
- Sprut-SD 2S25 A self-propelled gun mounted on the BMD-3 chassis with a turret mounting the stabilised 2A75 125 mm smoothbore gun 
- Iran: manufactured by reverse engineering.
- People's Republic of China: developed their own indigenous version
- Ukraine: made under license, by KMDB, in the city of Kharkiv.
- Hull, A.W., Markov, D.R., Zaloga, S.J. (1999). Soviet/Russian Armor and Artillery Design Practices 1945 to Present. Darlington Productions. ISBN 1-892848-01-5.
- Military Parade
- Enemy Forces
- Jane's Armour and Artillery 2002-2003
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