A beta enhancement circuit includes a current source connected in series with a transistor between two voltage supply lines. The handgun attachment further comprises a forward member adapted to have load exerted thereon and transferring the load to the subframe and not to the slide, thereby maintaining the handgun in battery and allowing the handgun to be fired in a close quarter situation. The gain control amplifier output level is used to control the gain level of the signal amplifier. This method avoids undesired changes of the total moment of rotational produced by the engine. Many modifications, variations, and alternatives are possible without departing from this embodiment.