A smart firing attachment (1, 1A, 1B) couples to a weapon (50), intended to fire projectiles, via one end of the
barrel (52) of the weapon (50). The attachment has a body (2) produced in the form of a hollow tube extending longitudinally along a longitudinal axis (XX') coaxial with a bore axis (TT') of the
barrel. The body (2) includes a
middle zone, a rear zone and a front zone, and defines a firing attachment chamber (2A) in the
middle zone, the rear zone and the front zone closing the body (2). The rear zone has a removable rear part (3) in the form of a tube portion provided with a locking element (4) for locking on the end of the
barrel (52) of the weapon (50), such that a
muzzle (54) of the weapon (50) is positioned inside the firing attachment chamber (2A), and closing said firing attachment to the rear of the
muzzle (54) of the weapon (50) in a substantially sealed manner. The
middle zone has a
pressure control housing (6) comprising an inlet orifice (6A) open to the firing attachment chamber (2A), an outlet orifice (6B) open towards the outside of the smart firing attachment (1) and a means for regulating a
gas pressure in the firing attachment chamber (2A), an air
pressure sensor (12) measuring an air pressure in the firing attachment chamber (2A), and a
processing module (20) coupled to the air
pressure sensor (12). The front zone has a removable front part (5) in the form of a tube portion closing the firing attachment chamber (2A).