A muzzle brake for weapons includes a body (1) that is joined to the firearm (6) and that incorporates two recesses (1a, 1b) on its surface, where a plurality of holes (1c) are located; and in which on each of the recesses (1a, 1b) a body (2) is located, which incorporates, in turn, a plurality of holes (2a) coinciding in number with the holes (1c) and located in the opposite direction in such a way that there is a reverse of gases coming from the firing of the projectile from the weapon (6).