Abstract: A shock-absorbing recoil mechanism for a semiautomatic firearm includes a pair of rigid plates positioned on opposite sides of a resilient sheet of energy-dissipating material. The plates and sheet are positioned in the U-shaped cavity of the firearm frame against reduced diameter shoulders formed toward the rear end thereof. The slide, when moving to its recoil position, thus contacts the forward plate instead of the shoulder in order to reduce the peak value of the recoil force applied to the frame by the slide. The shock-absorbing assembly may be combined with the recoil spring by utilizing a spring guide rod which projects through the plates and resilient material. The recoil spring surrounds the guide rod and projects forwardly against a cap mounted in the forward end of the slide.

Abstract: An adjustable sight for firearms of the type having a trapezoidally shaped dovetail extending transversely across the upper rear end of the firearm and a sighting bead projecting upwardly at the front of the slide. The adjustable sight includes a trapezoidally shaped base which replaces trapezoidally shaped, fixed sights normally mounted in the dovetail. The base is frictionally secured to the slide by a set screw extending through a threaded bore in the base which is torqued against the lower wall of the dovetail. A transverse slot formed in the base receives a sight blade having formed therein a notch projecting downwardly from its upper edge. The blade is held in place by a blade set screw mounted in a second threaded bore in the base. The set screw intersects the slot at an acute angle, and its end is sufficiently pointed so that its lower surface contacts the lower edge of an aperture formed in the blade.