This definition appears very rarely
These were Anti-Personel flechette rounds, High-Explosive, Anti-Tank (HEAT) rounds, HE, and armor-piercing. The rounds typically favored by the Ranger 90 Gunners were the HEAT and AP Flechette rounds. The AP Flechette rounds have a unique distribution pattern, similar in principle to a shotgun round, where increased distances to the target causes dispersal of the individual flechette rounds. The 90s were phased out by the Army in favor of Carl Gustav Ranger Anti-Armor Weapon.