Caliber modification using modular fire control group
View Patent ↗The present invention relates to an assembly for modifying a rifle to accommodate various calibers of ammunition and method for changing calibers in a rifle using same.
1. A caliber modification system for an existing rifle platform comprising:
a lower receiver;
the lower receiver comprising:
an independent fire control group comprising a trigger;
a fore end comprising a pivot pin and a fore end fire control group interface that; wherein
the fore end fire control group interface is removably affixed to the independent fire control group; and
the pivot pin is configured to interface with an upper receiver of the existing rifle platform;
a rear module comprising a rear module control group interface that is removably affixed to the independent fire control group and a buffer tube interface;
wherein the fire control group, the fore end, and rear module are separable from one another and when combined form the lower receiver.
2. The caliber modification system of claim 1 wherein a barrel is added as part of the caliber modification system.
3. The caliber modification system of claim 1 , wherein the fore end accommodates ammunition of a particular caliber.
4. The caliber modification system of claim 2 , wherein a replacement fore end with a caliber different from that of the fore end may be interchanged with the fore end to accommodate a different caliber.
5. The caliber modification system of claim 1 wherein the rear module further comprises a grip handle mounting.
6. A method for changing the caliber of an existing weapon comprising:
the weapon having a lower receiver, wherein the lower receiver comprises an independent fire control group comprising a trigger and a fore end comprising a pivot pin and a fore end fire control group interface, wherein the pivot pin is configured to interface with an upper receiver of the weapon;
attaching the fore end to the weapon, the fore end having a defined caliber and comprising a fore end fire control group interface that is removably affixed to the independent fire control group; attaching the independent fire control group to the fore end;
attaching a rear module to the independent fire control group, the rear module comprising a rear module control group interface and a buffer tube interface, the rear module control group interface removably affixed to the independent fire control group;
wherein the independent fire control group, the fore end, and the rear module are separable from one another and when combined form the lower receiver;
attaching the combined fore end, fire control group, and rear module to the weapon; and
attaching a first barrel with a caliber matching that of the fore end.
7. The method of claim 6 , further comprising replacing the first barrel with a second barrel, wherein the second barrel accommodates a caliber different than the first barrel.
8. The method of claim 6 , wherein the fore end accommodates ammunition of a particular caliber.
9. The method of claim 6 , further comprising interchanging the fore end with a replacement fore end to accommodate a different caliber.