On display in Hanoi, this type artillery piece fired on Khe Sanh, A4 and C2. It is the Russian designed M-46 130-mm Towed Field Gun
The 130-mm field gun M-46 has a recognizable long, thin tube with a cylindrical, perforated muzzle brake. It has a hydro-pneumatic recuperator located above and a recoil cylinder located below the tube. The gun has a manually operated horizontal sliding wedge breech-block. It fires case-type, variable-charge, separate-loading ammunition. The gun is mounted on a two-wheeled split trail carriage with large sponge-filled rubber tires on each of the single wheels. The M-46 also has direct fire sights.
The M-46 is an excellent indirect fire weapon with high muzzle velocity and exceptional range (27,490 meters). It is also a formidable antitank weapon with impressive armor penetration capability. Its tactical role usually is counter-battery. Its ammunition types included: FRAG-HE, APC-T, SP-46, Illuminating, and Smoke.

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