Modular forward assist for firearms

1. A device implementable on a firearm, comprising:

a forward assist assembly configured to be installed on an upper receiver of the firearm and, when pressed, move along a longitudinal axis of the forward assist assembly to engage with a serration cut on a bolt carrier of the firearm to push the bolt carrier forward with respect to the upper receiver when pressed, the forward assist assembly comprising a modular component slidingly attachable to and detachable from the forward assist assembly;

a plunger which, when pressed, moves along the longitudinal axis of the forward assist assembly to cause the bolt carrier of the firearm to move forward with respect to the upper receiver; and

a button as a part of the modular component and configured to be slidingly attached to and detached from the plunger,

wherein the button has a first primary side and a second primary side opposite the first primary side, wherein the first primary side is configured with two protrusions on two opposite ends of the first primary side, wherein each of the two protrusions is configured with a groove, and wherein, when the button is slidingly attached to the plunger, ledges on a first distal end of the plunger are received in the grooves on the two protrusions; and

wherein the forward assist assembly further comprises:

a button cover as another part of the modular component and configured to be detachably attached to the second primary side of the button.

2. The device of claim 1 , wherein the second primary side of the button has an indentation configured to receive a mating portion of the button cover therein.

3. The device of claim 2 , wherein the second primary side of the button further has a circumferential protrusion around in inner wall of the indentation, wherein the mating portion of the button cover has a circumferential groove around the mating portion thereof, and wherein, when the button cover is attached to the second primary side of the button, the circumferential groove of the mating portion of the button cover is received in the circumferential protrusion of the indentation of the button.

4. The device of claim 1 , wherein the button has a through hole communicatively connecting the first primary side and the second primary side of the button, and wherein, when the button cover is attached to the button, a portion of the button cover is exposed to the first primary side of the button via the through hole.

5. The device of claim 1 , wherein the forward assist assembly further comprises:

a forward assist spring;

a forward assist pawl;

a pawl detent;

a pawl detent spring;

a pawl spring pin; and

a plunger cover with a generally cylindrical shape,

wherein, when the forward assist assembly is assembled and installed on the upper receiver of the firearm:

the button is slidingly attachable to and detachable from the first distal end of the plunger,

the forward assist pawl is secured to a second distal end of the plunger opposite the first distal end thereof by the pawl spring pin with the pawl detent and the pawl detent spring disposed between the plunger and the forward assist pawl, and

the plunger cover surrounds the plunger with a first end of the plunger cover in contact with the button and a second end of the plunger cover opposite the first end thereof in contact with the forward assist spring.

6. The device of claim 5 , wherein each of the two protrusions on the first primary side of the button has a notch, wherein the first end of the plunger cover correspondingly has two tabs, and wherein, when the forward assist assembly is assembled, the two tabs on the first end of the plunger cover are received in the notches of the two protrusions of the button.

7. The device of claim 5 , wherein the first end of the plunger cover has a notch, and wherein, when the forward assist assembly is assembled, a portion of the first distal end of the plunger is visible through the notch of the plunger cover.

8. A device implementable on a firearm, comprising:

a forward assist assembly configured to be installed on an upper receiver of the firearm, comprising:

a plunger which, when pressed, moves along a longitudinal axis of the forward assist assembly to cause a bolt carrier of the firearm to move forward with respect to the upper receiver;

a button configured to be slidingly attached to and detached from the plunger;

wherein the button has a first primary side and a second primary side opposite the first primary side, wherein the first primary side is configured with two protrusions on two opposite ends of the first primary side, wherein each of the two protrusions is configured with a groove, and wherein, when the button is slidingly attached to the plunger, ledges on a first distal end of the plunger are received in the grooves on the two protrusions;

wherein the forward assist assembly further comprises: a button cover detachably attachable to the second primary side of the button; and

wherein the second primary side of the button has an indentation configured to receive a mating portion of the button cover therein.

9. The device of claim 8 , wherein the second primary side of the button has an indentation configured to receive a mating portion of the button cover therein.

10. The device of claim 8 , wherein the second primary side of the button further has a circumferential protrusion around in inner wall of the indentation, wherein the mating portion of the button cover has a circumferential groove around the mating portion thereof, and wherein, when the button cover is attached to the second primary side of the button, the circumferential groove of the mating portion of the button cover is received in the circumferential protrusion of the indentation of the button.

11. The device of claim 8 , wherein the button has a through hole communicatively connecting the first primary side and the second primary side of the button, and wherein, when the button cover is attached to the button, a portion of the button cover is exposed to the first primary side of the button via the through hole.

12. The device of claim 8 , wherein the forward assist assembly further comprises:

a forward assist spring;

a forward assist pawl;

a pawl detent;

a pawl detent spring;

a pawl spring pin; and

a plunger cover with a generally cylindrical shape.

13. The device of claim 12 , wherein, when the forward assist assembly is assembled and installed on the upper receiver of the firearm:

the button is slidingly attachable to and detachable from the first distal end of the plunger,

the forward assist pawl is secured to a second distal end of the plunger opposite the first distal end thereof by the pawl spring pin with the pawl detent and the pawl detent spring disposed between the plunger and the forward assist pawl, and

the plunger cover surrounds the plunger with a first end of the plunger cover in contact with the button and a second end of the plunger cover opposite the first end thereof in contact with the forward assist spring.

14. The device of claim 13 , wherein each of the two protrusions on the first primary side of the button has a notch, wherein the first end of the plunger cover correspondingly has two tabs, and wherein, when the forward assist assembly is assembled, the two tabs on the first end of the plunger cover are received in the notches of the two protrusions of the button.

15. The device of claim 13 , wherein the first end of the plunger cover has a notch, and wherein, when the forward assist assembly is assembled, a portion of the first distal end of the plunger is visible through the notch of the plunger cover.