Crossbow barrel

1. A crossbow barrel comprising

a first elongated shaft having

a proximal end of the first elongated shaft,

a distal end of the first elongated shaft opposite the proximal end of the first elongated shaft,

the first elongated shaft being elongated to define a first barrel axis of elongation extending from the proximal end of the first elongated shaft to the distal end of the first elongated shaft, and

a first barrel direction of elongation extending from the proximal end of the first elongated shaft to the distal end of the first elongated shaft; and

a second elongated shaft having

a proximal end of the second elongated shaft,

a distal end of the second elongated shaft opposite the proximal end of the second elongated shaft,

a top side,

the second elongated shaft being elongated to define a second barrel axis of elongation extending from the proximal end of the second elongated shaft to the distal end of the second elongated shaft, and

a second barrel direction of elongation extending from the proximal end of the second elongated shaft to the distal end of the second elongated shaft;

wherein,

the second barrel axis of elongation is parallel to the first barrel axis of elongation,

the second barrel axis of elongation is offset from the first barrel axis of elongation in a direction defining a top barrel direction perpendicular to the first barrel axis of elongation,

the first barrel direction of elongation and the second barrel direction of elongation are offset and point in the same direction,

the first elongated shaft has a cross-section area normal to the first barrel axis of elongation that is circular, and

the first elongated shaft has engagement components adapted to operationally engage with a counterpart component; and

wherein,

a) the first elongated shaft is tapered such that it decreases in cross-section area normal to the first barrel axis of elongation in the first barrel direction of elongation, or

b) the top side has an elongated recess therein parallel to the second barrel axis of elongation, the elongated recess dividing the top barrel side into,

a first lateral portion having a plurality of fins extending in plane normal to the top barrel direction away from the elongated recess, and

a second lateral portion opposite the first lateral portion across the elongated recess, the second lateral portion having a plurality of fins extending in plane normal to the top barrel direction away from the elongated recess.

2. The crossbow barrel of claim 1 , wherein the first elongated shaft has external threads adapted to threadedly engage with an internally-threaded counterpart component.

3. The crossbow barrel of claim 2 , wherein the top side has a normal direction pointing in the top barrel direction.

4. The crossbow barrel of claim 3 , wherein the top side has an elongated recess therein parallel to the second barrel axis of elongation, the elongated recess dividing the top barrel side into a first lateral portion and a second lateral portion opposite the first lateral portion.

5. The crossbow barrel of claim 4 , wherein the first elongated shaft is tapered such that it decreases in cross-section area normal to the first barrel axis of elongation in the first barrel direction of elongation.

6. The crossbow barrel of claim 5 , wherein the second elongated shaft is tapered such that it decreases in cross-section area normal to the second barrel axis of elongation in the second barrel direction of elongation.

7. The crossbow barrel of claim 6 , wherein the second elongated shaft has one or more fins, each of the fins extending in plane normal to the top barrel direction.

8. The crossbow barrel of claim 7 , wherein the second elongated shaft has

a first fin extending in plane normal to the top barrel direction from the first lateral portion away from the elongated recess;

a second fin extending in plane normal to the top barrel direction from the first lateral portion away from the elongated recess;

a first fin extending in plane normal to the top barrel direction from the second lateral portion away from the elongated recess; and

at least a second fin extending in plane normal to the top barrel direction from the second lateral portion away from the elongated recess.

9. A crossbow comprising

a crossbow barrel having

a first elongated shaft having

a proximal end of the first elongated shaft and

a distal end of the first elongated shaft opposite the proximal end of the first elongated shaft,

the first elongated shaft being elongated to define a first barrel axis of elongation extending from the proximal end of the first elongated shaft to the distal end of the first elongated shaft, and

a first barrel direction of elongation extending from the proximal end of the first elongated shaft to the distal end of the first elongated shaft; and

a second elongated shaft having

a proximal end of the second elongated shaft and

a distal end of the second elongated shaft opposite the proximal end of the second elongated shaft,

the second elongated shaft being elongated to define a second barrel axis of elongation extending from the proximal end of the second elongated shaft to the distal end of the second elongated shaft, and

a second barrel direction of elongation extending from the proximal end of the second elongated shaft to the distal end of the second elongated shaft; and

wherein,

the second barrel axis of elongation is parallel to the first barrel axis of elongation,

the second barrel axis of elongation is offset from the first barrel axis of elongation in a direction defining a top barrel direction perpendicular to the first barrel axis of elongation

the first direction of elongation and the second direction of elongation are offset and point in the same direction,

the first elongated shaft has a cross-section area normal to the first barrel axis of elongation that is circular, and

the first elongated shaft has engagement components adapted to operationally engage with a counterpart component;

a riser having

a first elongated channel defining a through hole in the riser, the first elongated channel having

a proximal end of the first elongated channel and

a distal end of the first elongated channel opposite the proximal end of the first elongated channel,

the first elongated channel being elongated to define a first riser axis of elongation extending from the proximal end of the first elongated channel to the distal end of the first elongated channel, and

a first riser direction of elongation extending from the proximal end of the first elongated channel to the distal end of the first elongated channel; and

a second elongated channel having

a proximal end of the second elongated channel and

a distal end of the second elongated channel opposite the proximal end of the second elongated channel,

the second elongated channel being elongated to define a second riser axis of elongation extending from the proximal end of the second elongated channel to the distal end of the second elongated channel, and

a second riser direction of elongation extending from the proximal end of the second elongated channel to the distal end of the second elongated channel; and

wherein,

the second riser axis of elongation is parallel to the first riser axis of elongation,

the second riser axis of elongation is offset from the first riser axis of elongation in a direction defining a top riser direction perpendicular to the first riser axis of elongation

the first riser direction of elongation and the second riser direction of elongation are offset and point in the same direction, and

the first riser elongated channel has a cross-section area normal to the first riser axis of elongation that is circular;

a set of crossbow limbs operationally engaged with the riser;

wherein the riser is operationally engaged with the crossbow barrel in such a way that

the first elongated shaft is inserted within the proximal end of the first elongated channel to extend through the first elongated channel and protrude from the distal end of the first elongated channel,

the second elongated shaft is inserted within the second elongated channel,

the first barrel direction of elongation is parallel with and is in the same direction as the first riser direction of elongation,

the second barrel direction of elongation is parallel with and is in the same direction as the second riser direction of elongation, and

the riser is restrained from moving with respect to the barrel; and

a counterpart component operationally engaged with the first elongated shaft and the riser to restrain the riser from moving with respect to the crossbow barrel.

10. The crossbow of claim 9 , wherein the first elongated shaft has external threads adapted to threadedly engage with an internally-threaded counterpart component.

11. The crossbow of claim 10 , wherein the second elongated shaft has a top side having a normal direction pointing in the top barrel direction.

12. The crossbow of claim 11 , wherein the top side has an elongated recess therein parallel to the second barrel axis of elongation, the elongated recess dividing the top barrel side into a first lateral portion and a second lateral portion opposite the first lateral portion.

13. The crossbow of claim 12 , wherein the first elongated shaft has a cross-section area normal to the first barrel axis of elongation that decreases by tapering in first barrel direction of elongation.

14. The crossbow of claim 13 , wherein the second elongated shaft has a cross-section area normal to the second barrel axis of elongation that decreases by tapering in the second barrel direction of elongation.

15. The crossbow of claim 14 , wherein the first elongated channel has a cross-section area normal to the first riser axis of elongation that decreases by tapering in first riser direction of elongation.

16. The crossbow of claim 15 , wherein the second elongated channel shaft has a cross-section area normal to the second barrel axis of elongation that decreases by tapering in the second barrel direction of elongation.

17. A method of assembling a crossbow comprising

providing a crossbow barrel having

a first elongated shaft having

a proximal end of the first elongated shaft and

a distal end of the first elongated shaft opposite the proximal end of the first elongated shaft,

the first elongated shaft being elongated to define a first barrel axis of elongation extending from the proximal end of the first elongated shaft to the distal end of the first elongated shaft, and

a first barrel direction of elongation extending from the proximal end of the first elongated shaft to the distal end of the first elongated shaft, and

a second elongated shaft having

a proximal end of the second elongated shaft and

a distal end of the second elongated shaft opposite the proximal end of the second elongated shaft,

the second elongated shaft being elongated to define a second barrel axis of elongation extending from the proximal end of the second elongated shaft to the distal end of the second elongated shaft, and

a second barrel direction of elongation extending from the proximal end of the second elongated shaft to the distal end of the second elongated shaft, and

wherein,

the second barrel axis of elongation is parallel to the first barrel axis of elongation,

the second barrel axis of elongation is offset from the first barrel axis of elongation in a direction defining a top barrel direction perpendicular to the first barrel axis of elongation the first direction of elongation and the second direction of elongation are offset and point in the same direction,

the first elongated shaft has a cross-section area normal to the first barrel axis of elongation that is circular, and

the first elongated shaft has engagement components adapted to operationally engage with a counterpart component;

providing a riser having

a first elongated channel defining a through hole in the riser, the first elongated channel having

a proximal end of the first elongated channel and

a distal end of the first elongated channel opposite the proximal end of the first elongated channel,

the first elongated channel being elongated to define a first riser axis of elongation extending from the proximal end of the first elongated channel to the distal end of the first elongated channel, and

a first riser direction of elongation extending from the proximal end of the first elongated channel to the distal end of the first elongated channel; and

a second elongated channel having

a proximal end of the second elongated channel and

a distal end of the second elongated channel opposite the proximal end of the second elongated channel,

the second elongated channel being elongated to define a second riser axis of elongation extending from the proximal end of the second elongated channel to the distal end of the second elongated channel, and

a second riser direction of elongation extending from the proximal end of the second elongated channel to the distal end of the second elongated channel; and

wherein,

the second riser axis of elongation is parallel to the first riser axis of elongation,

the second riser axis of elongation is offset from the first riser axis of elongation in a direction defining a top riser direction perpendicular to the first riser axis of elongation

the first riser direction of elongation and the second riser direction of elongation are offset and point in the same direction, and

the first riser elongated channel has a cross-section area normal to the first riser axis of elongation that is circular;

operationally engaging the riser with the crossbow barrel in such a way that

the first elongated shaft is inserted within the proximal end of the first elongated channel to extend through the first elongated channel and protrude from the distal end of the first elongated channel,

the second elongated shaft is inserted within the second elongated channel, and

the riser is restrained from moving with respect to the barrel; and

operationally engaging a counterpart component with the first elongated shaft.

18. The method of assembling a crossbow of claim 17 further comprising threadedly engaging the counterpart component with the first elongated shaft.

19. The method of assembling a crossbow of claim 18 , wherein the first elongated shaft has a cross-section area normal to the first barrel axis of elongation that decreases by tapering in first barrel direction of elongation.

20. The method of assembling a crossbow of claim 19 , wherein the first elongated channel has a cross-section area normal to the first riser axis of elongation that decreases by tapering in first riser direction of elongation.