Telescoped ammunition round having subcaliber projectile sabot with integral piston

A telescoped ammunition round comprising:

• a propellant charge having an axial cavity for supplying firing power for said ammunition round;
• a control tube means housed within said axial cavity for selectively covering an aft surface portion of said axial cavity, said control tube means having a generally cylindrical axial bore substantially coaxial with said axial cavity;
• a discarding sabot concentric with and extending axially within said axial cavity, having an aft end within said axial bore, said sabot comprising at its aft end a piston integral therewith, said piston having a generally cylindrical outer surface forming a sliding fit with said axial bore;
• a subcaliber projectile mounted within said discarding sabot;
• a booster charge mounted within said axial bore aft of said piston, said discarding sabot being forwardly moveable in response to pressure against a rearward facing surface of said piston generated during firing of said booster charge and said projectile being forwardly moveable by forward movement of said discarding sabot;
• and
• a primer means in communication with said booster charge for actuating a firing of said ammunition round.