It is carried in the gun tube by a three-piece aluminum sabot, which separates into three "petals" soon after the round leaves the gun tube. The M829 has a ballistic nose and five tail fins made of aluminum. Variants A diagram of an M829A2 round M829 The penetrator is carried by a sabot during its acceleration in the gun barrel. The round is specifically designed for the 120 mm M256 main gun on the Abrams M1A1 and M1A2 main battle tanks. Modeling was done at the Ballistic Research Laboratory at Aberdeen Proving Ground, which was incorporated into the Army Research Laboratory in 1992.
The M829 is an American armor-piercing fin-stabilized discarding sabot ( APFSDS) tank round.
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