Abstract: A recoil compensator and climb arrester has an axially-elongated hollow sidewall having an inner surface. Three apertured baffles with central apertures are fixed inside the sidewall spaced apart from one another to define three longitudinally-distributed gas-expansion chambers. Each baffle has a convex rear surface which meets the sidewall in a circular crease. Each chamber has one top port through the sidewall as well as a pair of opposite side ports. Each port has a one edge, a sill, which is closest to the crease. The distance between the sill and the crease defining a knee wall. Wherein, the expansion of the gases of a muzzle blast in the expansion chambers deflect in part off convex rear surfaces of the baffles and get checked in part by the knee-wall portions of each port ensuing the exhausting of the gases through ports across the sills thereof.