Composite hand guard with integral rail

1. A firearm accessory device in combination with a firearm having a barrel, the device comprising:

a) an elongated tube extending axially along at least a portion of a length of the barrel and extending circumferentially around the barrel;

b) a hand guard formed by the tube around a bottom and lateral sides of the tube at a proximal end of the tube;

c) an elongated rail formed by the tube along a top of the tube, a bottom of the tube at a distal end of the tube, a lateral side of the tube at the distal end of the tube, or combinations thereof;

d) a monolithic shell wall forming the tube and extending circumferentially around the barrel and forming the hand guard and the elongated rail, the shell wall substantially surrounding the barrel in a spaced-apart relationship;

e) the elongated rail being aligned with the shell wall and the barrel, and having a cross-sectional shape orthogonal to the shell wall and the barrel with a narrower neck and a wider head, and the enlarged head being segmented along a length thereof;

f) an elongated hollow defined between the barrel and the shell wall, and extending continuously and uninterrupted radially between the barrel and the shell wall, and into the narrower neck of the rail;

g) the shell wall being formed by a composite material with a fiber in a resin matrix; and

h) the rail including additional longitudinal fibers with respect to the hand guard.

2. A device in accordance with claim 1 , wherein the hand guard has a convex curvature free of the rail.

3. A device in accordance with claim 1 , wherein the elongate hollow comprises an annular hollow and a channel connected thereto defined by the rail.

4. A device in accordance with claim 1 , wherein the shell wall has a non-uniform thickness extending circumferentially.

5. A device in accordance with claim 1 , further in combination with an accessory detachably coupled to the rail, the accessory being selected from the group consisting of: a hand grip with an axis transverse to the longitudinal axis of the barrel; a light source; a laser; a scope; a tactical scope; a sight; a night vision system; a bipod; a stand; a rail cover; a carrier or mount; a stock; a retractable stock; a foregrip; a sling; a sling mount or adaptor; a magazine pouch; a bayonet; a bayonet mount; a clamp or fixture or combinations thereof.

6. A device in accordance with claim 1 , wherein the shell wall is continuous and uninterrupted and seamless as the shell wall circumscribes the barrel.

7. A device in accordance with claim 1 , wherein a fiber density at the rail is 60-70% greater than at the hand guard.

8. A device in accordance with claim 1 , wherein the hand guard and the rail are integrally formed together at the same time as the shell wall.

9. A firearm accessory device in combination with a firearm having a barrel, the device comprising:

a) a hand guard disposed around at least a portion of the barrel and having an elongate shell with an axis aligned with an axis of the barrel, the shell having a shell wall spaced-apart from and circumscribing the barrel;

b) an elongated rail protruding from the shell and defined by the shell wall, the rail having an axis aligned with an axis of the shell and the barrel, the rail having a cross-sectional shape orthogonal to the axis with a narrower neck and a wider head coupled to the shell by the neck;

c) an elongate hollow defined by the shell wall with the hollow extending longitudinally between the barrel and the shell wall, and radially between the barrel and the shell wall and into the neck of the rail;

d) the shell wall being formed by a composite material with a fiber in a resin matrix; and

e) the rail including additional longitudinal fibers with respect to the hand guard.

10. A device in accordance with claim 9 , wherein the cross-sectional shape of the rail interrupts a circumference of the hand guard.

11. A device in accordance with claim 9 , wherein the elongate hollow comprises an annular hollow and a channel connected thereto defined by the rail.

12. A device in accordance with claim 9 , wherein the shell wall has a non-uniform thickness extending circumferentially.

13. A device in accordance with claim 9 , further in combination with an accessory detachably coupled to the rail, the accessory being selected from the group consisting of: a hand grip with an axis transverse to the longitudinal axis of the barrel; a light source; a laser; a scope; a tactical scope; a sight; a night vision system; a bipod; a stand; a rail cover; a carrier or mount; a stock; a retractable stock; a foregrip; a sling; a sling mount or adaptor; a magazine pouch; a bayonet; a bayonet mount; a clamp or fixture or combinations thereof.

14. A device in accordance with claim 9 , wherein the hand guard is formed along a proximal portion of the shell and the rail is formed along a distal portion of the shell.

15. A device in accordance with claim 9 , wherein the hand guard has a plurality of spaced-apart ridges oriented transverse to the longitudinal axis on an outer surface of the shell.

16. A device in accordance with claim 9 , wherein the hand guard has a convex curvature free of the rail.

17. A device in accordance with claim 9 , wherein the hand guard and the rail are a monolithic structure with the shell wall being continuous and uninterrupted and seamless as the shell wall circumscribes the barrel.

18. A device in accordance with claim 9 , wherein a fiber density at the rail is 60-70% greater than at the hand guard.

19. A device in accordance with claim 9 , wherein the hand guard and the rail are integrally formed together at the same time as the shell wall.