DRY FIRE PRACTICE TRAINING DEVICE WITH BOLT CARRIER GROUP FOR RIFLES

Abstract

When a semi-automatic rifle is live fired, it is ready to be fired again. The shooter's hands remain in the firing position, and just the trigger finger and trigger are employed. But with dry fire practice, the shooter must cycle the rifle's bolt to reset the firing pin. The shooter must move one hand from the shooting position on the rifle, the rifle's long bolt is pulled back to reset the firing pin, the rifle repositioned, a new sight picture acquired, and then the next trigger press can be accomplished. This invention replaces the rifle's bolt carrier group and provides realistic muscle memory training by duplicating the action of the trigger, the feel and the sound of the release of the firing pin, and the resetting of the trigger for additional trigger activations. The invention does not interact with the rifle's firing pin.

Claims

1. A dry fire practice device to be used in AR 15 type rifles which replaces the bolt carrier group (BCG) during the training session, designed to approximate the size and dimensions of a functioning BCG, thus having a basic cylindrical shape, said device being comprised of: a cylinder for housing the other parts of the device; a lever assembly providing a means for interaction between the rifle's trigger and a détente reed; a detente reed which provides audible and tactile simulation of the rifle's firing pin release and reset; a machine set screw for regulating said detente reed; a set of two compression springs; one providing a downward force to return said lever to its initial resting position; a second for extending a cylindrical plunger for locating the training device in the rifle's BCG's compartment; a lifter for transferring the action of the rifle's trigger to said lever; a hammer stop for isolating the rifle's hammer from release; and a plunger mechanism to locate the device in its proper functioning position; whereby the dry fire practice training device provides realistic, audible and tactical feedback during repetitive dry fire training for AR type rifles.

2. The dry fire training device of claim 1, said cylindrical housing comprised of three pairs of small holes for locating pins to hold other components in the cylinder; a raised section on one end for locating of cylinder in the rifle's BCG compartment; a threaded hole in the top of the cylinder for the machined set screw; a plug recessed in one end of the cylinder that has a cylindrical notch in the front side to locate a coiled spring which pushes the cylindrical plunger forward; a cylindrical projection on the lower inside of the cylindrical housing to locate one end of one of the coil springs; and a section removed from the lower portion of the cylinder for said lever assembly to mount and function.

3. The dry fire training device of claim 1, said lever assembly being comprised of two angled projections on its top for mounting of said détente reed; another rectangular projection with a slotted hole to aid in guiding said lever in it's up and down motion; another cylindrical projection to allow for one of the coil springs to locate on lever; a notch in the lower surface of the lever for the trigger lifter to locate into; and a pair of small holes near the opposite end of the lever for the lever to rotate or swing on.

4. The dry fire training device of claim 3, said lever assembly being further comprised of a detente reed affixed to the angled projections by means a small machine screw, said detente reed providing audible and tactile simulation of the rifle's firing pin release and reset.

5. The dry fire training device of claim 1, said cylindrical plunger fabricated with dimensions to fit inside the front end of the cylinder housing; a smaller cylindrical projection on the front that will locate inside the chamber of the rifle; the cylindrical plunger also having a notched-through hole allowing controlled movement in and out of the cylinder housing; and a cylindrical hole in the other end of said cylinder plunger to locate a second coiled spring which pushes the cylinder plunger forward to locate the dry fire training device with respect to the rifle's chamber.

6. The dry fire training device of claim 1, comprised of a machine set screw which is located in the top of the cylindrical housing providing a means of regulating when the detente reed activates to simulate the release and reset of the rifle's firing pin.

7. The dry fire training device of claim 1, comprised of two compression springs; one providing a downward force to return said lever to its initial resting position; and a second compression spring for extending the cylindrical plunger forward for locating the training device in the rifle's BCG's compartment.

8. The dry fire training device of claim 1, comprised of a non attached trigger lifter which rests on the rifle's trigger, moving up and down with the movement of the trigger and transfers that movement to the lever assembly being located in a notch in the lower surface of the lever assembly.

9. The dry fire training device of claim 1, comprised of another non attached hammer stop which is inserted between the trigger hammer and its housing thus not allowing the trigger hammer to release when the trigger is activated.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0023] FIG. 1 illustrates an isometric view of a cylinder with various holes and cutaways.

[0024] FIG. 1-A illustrates an end view of the cylinder showing a recessed plug with a cylindrical depression for one end of one of the coil springs.

[0025] FIG. 2 illustrates an isometric view of a plunger.

[0026] FIG. 2-A illustrates an end view of the plunger showing a cylindrical depression for one end of one of the coil springs.

[0027] FIG. 3 illustrates a detente reed.

[0028] FIG. 4 illustrates an isometric view of a coil spring.

[0029] FIG. 5 illustrates an isometric view of a lever.

[0030] FIG. 6 illustrates an isometric view of a hammer block.

[0031] FIG. 7 illustrates an isometric view of a transfer block.

[0032] FIG. 8 illustrates an isometric view of a set screw.

[0033] FIG. 9 illustrates an isometric view of a hinge pin.

[0034] FIG. 10 illustrates a middle sectional view of an assembly of the bolt carrier group in its resting position.

[0035] FIG. 11 illustrates a middle sectional view of an assembly of the bolt carrier group in its activated position.

DETAILED DESCRIPTION OF THE INVENTION

[0036] FIG. 1 illustrates an isometric view of the cylinder 1 with a lower section removed, three pairs of holes to mount other parts, an upper raised section for maintaining the position of the cylinder 1 in the rifle's BCG compartment with a mid section for mounting the regulating screw 8 for adjusting the detente reed 3.

[0037] FIG. 1-A illustrates an end view of the cylinder 1 showing an internal plug with a cylindrical hole for one of the coil springs 4.

[0038] FIG. 2 illustrates an isometric view of the plunger 2 with a through slot for one of the fulcrum pins 9 to pass through for limiting the back and forth motion of the plunger 2, and a smaller projection from one end which locates into the chamber of the rifle thus positioning the cylinder 1 in the rifle's BCG's compartment.

[0039] FIG. 2-A illustrates the opposite end of the plunger 2 showing a cylindrical hole for locating one end of one of the coil springs 4.

[0040] FIG. 3 illustrates the detente reed 3 that supplies the snap sound and the tactile feel of the simulated release of the rifle's firing pin.

[0041] FIG. 4 illustrates one of the coil springs 4, one of which returns the lever 5 assembly to its resting position when the trigger is released, another for extending the plunger 2 for locating the device into the chamber of the rifle.

[0042] FIG. 5 illustrates the lever 5 with a pair of holes for the lever 5 to swing on the fulcrum pin 9, a pair of inclined ramps for mounting the detente reed 3, a rectangular projection that houses a slotted hole to guide the lever 5 in its up and down motion and limited in its motion by the fulcrum pin 9, and a small raised cylindrical projection to retain one end of one of the coiled springs 4.

[0043] FIG. 6 illustrates the hammer keeper 6 which prevents the trigger hammer from falling when the trigger is activated.

[0044] FIG. 7 illustrates the transfer block 7 which transfers the up and down movement of the trigger to the lower side of the lever 5.

[0045] FIG. 8 illustrates the set screw 8 that is used to regulate when in the movement of the lever 5 assembly that the detente reed 3 activates.

[0046] FIG. 9 illustrates the fulcrum pin 9 that pins the various parts together and/or allows for the controlled movement of these parts.

[0047] FIG. 10 illustrates a sectional drawing of the assembled bolt carrier group consisting of the cylinder 1 to house the various parts comprised of the spring loaded plunger 2 which locates the front end of the device in the rifle, the lever 5 which has the detente reed 3 secured to its top surface providing the tactile and audible simulation of the rifle's firing pin release and reset, a projection for one end of the coil springs 4 which returns the lever 5 to its resting position. The cylinder 1 also has the setscrew 8 which allows for the adjusting of the position when the detente reed 3 snaps, simulating the release and reset of the rifle's firing pin.

[0048] FIG. 11 illustrates a sectional drawing of the assembled bolt carrier group in its activated position showing the lever 5 raised, the detente reed 3 bent and activated, and the transfer block 7 raised.