A-ha success with two more hit singles from the same album—"Train of Thought" and "Hunting High and Low" (with another innovative video) —and the band remained popular throughout the 1980s and early 1990s. The band's first album, 1985's "Hunting High and Low", became a worldwide bestseller, spending most of October and November in the top 20 of "Billboard"'s Top 200 album chart. The album and its four hit singles garnered international recognition for A-ha. "Hunting High and Low" earned triple platinum status in the UK, and reached platinum status in the US and Germany, while earning gold in Brazil and the
High–low system High-Low Principle, but with a twist on the original design. The GP-25 40-mm grenade launcher fits under the assault rifle and fires a caseless projectile that is muzzle-loaded. Instead of having a case, the high-pressure chamber is located on the rear of the projectile with ten vent holes, in which the launcher barrel acts as the low-pressure chamber. The ignition of the propellant gases also causes the drive band to engage the launcher grooves, similar to the American Civil War Parrott muzzle loading rifled cannon. While little documentation exists, in the 1950s the Soviet Army developed 73-mm cannon for wheeled