A device for adjusting the force between the rifle barrel and the forearm of the stock comprising a stabilizing block having a concave groove formed on the upper surface thereof to engage the rifle barrel. An adjuster screw having an enlarged head is rotatably positioned in a socket formed in the lower side of the stabilizing block and retaining pins retain the head of the screw within the socket. A screw housing is rigidly secured within the stock close to the end of the forearm. The adjuster screw is threadedly secured to the screw housing such that the stabilizing block may be moved relative to the screw housing and forearm to adjust the force on the rifle barrel.
A harmonic vibration tuning device is provided in the forestock of a rifle engaging a cantilevered barrel forward of the rifle action, for the purpose of effecting a change the harmonic vibration frequency of the barrel, that is generated, as a projectile moves through the barrel to the muzzle. This adjustable change in the harmonic vibration frequency of the barrel causing a controllable change in the impact placement of a plurality of fired projectiles. The harmonic vibration tuning device of the preferred embodiment includes a containment assembly that is mounted in a cavity formed in the forestock. The assembly includes a threaded adjustment shaft extending horizontally through the assembly with the shaft being threadedly mated with a reactive contact means. The reactive contact means, of the preferred embodiment, engages the surface of the barrel permitting a force to be exerted between the forestock and the barrel. The threaded shaft protrudes toward the front surface of the forestock to enable it to be rotationally adjusted. The assembly also contains a shaft inadvertent rotation prevention device to apply sufficient force against the threaded shaft to allow both for desired incremental rotational adjustment of the threaded shaft, while at the same time inhibiting undesirable rotation of the shaft during discharge or handling of the rifle. The threaded shaft is secured to the assembly to prevent undesired longitudinal movement of the threaded shaft and the reactive contact means within the assembly. When the threaded shaft is rotated the reactive contact means moves longitudinally along the axis of the barrel. This motion causes a change in the longitudinal contact point of engagement of the reactive contact means and the barrel. This change of longitudinal positioning of the reactive contact means which is engaging the barrel with sufficient pressure, causes a change in the harmonic vibration characteristics of the barrel.
A vibration dampening device 10 is provided in the forearm 14 of a rifle 10 for engaging a cantilevered barrel 12 forward of the rifle action for dampening the vibration of the barrel as a bullet moves through the barrel to the muzzle. The vibration dampening device in the preferred embodiment includes an insert 44 that is mounted in a cavity 38 formed in the forearm 14. The insert includes a threaded bore 48 with a pressure screw 50 threadably mounted in the bore 48 in which the threaded screw has a pointed end 54 engaging the barrel at a selected point. A tool access aperture 58 extends through the forearm from the lower profile surface 16 in alignment with the threaded bore 48 for enabling a tool to be inserted through a tool access aperture 58 to engage the pressure screw 50 to rotate the pressure screw to the desired position. Preferably a locking means 60 is provided for locking the pressure screw 60 in place when the correct pressure is obtained.
A tubular shaped collar (22) of predetermined mass having internal threads (23) and an internal tapered area (21) which is threaded onto a tubular shaped insert (26) of flexible composition that has threads (44) that match the threads (23) of the collar and is tapered in a manner to match the taper (21) of the collar. The insert has a plural of longitudinal slits (25) in the tapered area. The insert is threaded into the collar and the collar and insert are slid over the muzzle end of a firearm barrel where they are locked in place by tightening the collar onto the insert whereby the predetermined angle of the taper (21) of the collar compresses the insert tightly against a firearm barrel. The insert and collar are adjustably positioned on the firearm barrel and held in place while being tightened by a tubular shaped tool (32) which has means of mating with the insert and has a means of calibration to determine the relative position of the collar and insert on a firearm barrel. The collar and insert are moved axially along the firearm barrel to a location whereby the predetermined mass of the collar will tune the harmonic vibrations of the firearm barrel and promote greater accuracy.
A weapons barrel oscillation reduction apparatus includes a plurality of donut shaped rings or washers mounted on the muzzle end portion of a weapons barrel. The weapons barrel has breech and muzzles end portions and provides a machined ring carrying outer surface at the muzzle end portion. An annular shoulder at one end portion of the ring carrying portions acts as a stop for the plurality of rings mounted thereon. A retainer can be removably attached to the opposite end of the ring carrying surface. Upon assembly, the rings can move slightly in a longitudinal direction with respect to each other during a firing of a projectile from the weapons barrel, the weight of the rings and the slight movement of the rings function to reduce barrel oscillation.
