In June 1942, the Breda Brescia produced 10.000 copies to be submitted to the high rank of the military, but the explosive device, due to numerous missing activations, did not pass the test carried out in April 1943.

[1] With the creation of specific "tanks-hunters" units, which took place precisely in 1942, two types of anti-tank grenades were adopted, an explosive and an incendiary one.

The final model instead adopted a bucket in sheet instead of the headphone retraction, thus reducing the time of the slipping of the automatic safety.

[3] The throw was performed as follows: the ordinary security was removed from the spool, then the bucket of the automatic safety detached from the bomb, by gravity or under the action of a spring; the cross bar, dragged from the headphone weight was then slipped from its housing.

This was true between the first 3–5 m. of the trajectory, after which the fuze, as capsule and percussor were kept spaced only by the spring, was run under conditions of impact against any resistant object and consequently of causing the deflagration of an extra charge contained in the sphere.