Iraq Combat Footage M2A3 Bradley M1A1 Abrams

Thanks for spelling it out for that guy man, some people just don't know when to shut up.

The Smoothbore gun is also predominately used because of the length of modern projectile's. The spin from rifling decreases the effective penetration of these projectiles (velocity and impact energy). The Armour-Piercing Fin-Stabilized Discarding Sabot (KE projectile) is a prime example.

The Challenger Lethality Improvement Programme is a programme to upgrade the main gun of Challenger 2 from its current 120mm L30A1 rifled gun to the 120mm Rheinmetall L55 smoothbore gun. This is because the Challengers riffled barrel causes Kenetic energy penetrators to become slow and less stable by transferring the kenetic energy to centrifugal rotational energy.

HEAT = High Explosive Anti-Tank warheads have High Explosive in the name, so you can see this stems confusion for me. However the Rheinmetall 120-millimeter (4.7 in) L/55 is used in many countries: In South Korea for the K1A1, in Japan for the Type-90, and in the US for use with the M829A2 and M829A3; as the US designs these HEAT rounds to counter specific foreign advancements: the Russian Kontakt-5 and Kaktus third-generation explosive reactive armours.

Thanks for spelling that out for the F**k wads in the crowd. I cant believe how many stupid fuckers log on to youtube and think they know what's up!