What tank gun has the highest muzzle velocity?

Rheinmetall Rh-120
Caliber	120 millimetres (4.72 in)
Carriage	120 x 570 mmR
Muzzle velocity	L/44: 1,530 to 1,650 m/s (5,000 to 5,400 ft/s) L/55: 1,640 to 1,750 m/s (5,400 to 5,700 ft/s)
Effective firing range	4,000 meters (4,400 yd) with DM63 8,000 meters (8,700 yd) with LAHAT anti-tank guided missile

What is the difference between smooth bore firearms and rifled bore firearms?

Modern firearms come in two primary forms: smooth bore and rifled bore. A smooth-bore weapon has a barrel that is completely smooth on the inside, while a rifled-bore weapon has grooves that help guide a bullet down the length of the barrel.

Who makes the m1a1 Abrams tank?

General Dynamics Land Systems

M1 Abrams
Designer	Chrysler Defense (now General Dynamics Land Systems)
Designed	1972–1975
Manufacturer	Lima Army Tank Plant (since 1980) Detroit Arsenal Tank Plant (1982–1996)
Unit cost	US$6.21 million (M1A2 / FY99) Estimated in 2016 as US$8.92 million (with inflation adjustment)

What is smooth bore gun?

A smoothbore weapon is one that has a barrel without rifling. Smoothbores range from handheld firearms to powerful tank guns and large artillery mortars.

Why does the challenger have a rifled gun?

The tank has a 550 km range and maximum road speed of 59 km/h. Unique among NATO main battle tank armament, the L30A1 is rifled, because the British Army continues to place a premium on the use of high-explosive squash head (HESH) rounds in addition to armour-piercing fin-stabilised discarding-sabot rounds.

Why is M1 Abrams smoothbore?

The reason tank guns are smoothbore is the switch from HEAT (High Explosive Anti-Tank) to kinetic energy rounds sabot as the primary anti-tank round. Kinetic energy rounds are subcaliber rounds (smaller than the bore) and aren’t effective if the spun by rifling.

https://www.youtube.com/watch?v=jdcx8FULQX0