Abstract: A gas actuator (21) and a pop-up target (10) incorporating the gas actuator (21) are disclosed. The gas actuator (21) comprises support surfaces (24, 26), pivoting surfaces 5 (64,66) pivotably coupled upon the support surfaces (24, 26), respectively, and flexible and inflatable members (18, 20) disposed for pivoting the pivoting surfaces (64, 66) with respect to the support surfaces (24, 26) between a first and a second position. The members (18, 20) act over a relatively large area between the support surfaces (24, 26) and the pivoting surfaces (64, 66). The magnitude of the pivoting force produced by the members (18, 20) increases to a maximum and thereafter decreases as the pivoting surface (64) pivots upwards. An accumulator (104) allows for relatively low flow rates of as from a source of compressed as (102) and provides relatively high flow rates of compressed as to the members (18, 20).