Sighting system for a firearm-carried grenade launcher

Claim 2

A sighting system for a firearm comprising a shouldersupported rifle and a launcher for grenades mounted thereon including a front sight, a channeled metering bar mounting said front sight on said launcher for sliding elevational adjustments, a rear sight including an aperture, means for mounting said rear sight for windage adjustment, and a lug on said rifle cooperating with said rear sight for releasably securing said rear sight in an extended operative position and a folded inoperative position.

Claim 3

The sighting system as defined in claim 1 wherein said metering bar is provided with a scale calibrated according to increments of range distances and said front sight is provided with an index line alignable with said calibrations, and including a T-slot formed in said firearm for slidingly mounting said metering bar for bore sight adjustment and to incline said metering bar relative to the vertical axis of the firearm so as to position said front sight for automatically compensating said front sight for lateral drift of the grenades at the different range calibrations on saId metering bar.

Claim 4

The sighting system as defined in claim 2 wherein said metering bar is provided with a channel of T-configuration for slidingly mounting said front sight, and including a spring-pressed ball in said front sight, and spherical indents in said channel cooperating with said ball for releasably securing said front sight at the different calibrations on said metering bar.

Claim 5

The sighting system as defined in claim 2 wherein said front sight is mounted on said launcher and said rear sight is mounted on said rifle.

Claim 6

The sighting system as defined in claim 2 wherein said lug is longitudinally disposed on the rifle and is of hexagonal configuration in cross section, and including a collar portion of said rear sight encircling said lug to provide pivotal support for said rear sight and permit radial movement thereof respective to said lug, a spring-biased plunger pressed against said lug, a one side of said lug arranged for contact by said plunger when said rear sight is in the extended operative position, a pair of sides of said lug disposed opposite said one side so as to be pressed against a mating pair of surfaces in said collar by the bias of said plunger to releasably hold said rear sight in the extended operative position and so as to be free of said pair of surfaces when said rear sight is pressed inwardly against the bias of said plunger to release said rear sight for pivotal displacement to a folded inoperative position, and a fourth side on said lug contactable by said plunger when said rear sight is in the inoperative position to releasably hold the sight therein.