Paintball marker with quick access receiver

1. A paintball marker comprising:

a barrel having a bore dimensioned to receive a frangible projectile;

a receiver including a plurality of walls defining an interior cavity with a breech area;

a valve arrangement configured to selectively allow flow between a supply of compressed gas and the breech area to propel the frangible projectile through the barrel;

a front bolt movable between a first position and a second position, wherein the front bolt is configured to push the frangible projectile towards the barrel as the front bolt moves from the first position to the second position;

a rear bolt connected to the front bolt with a linkage arm and movable between a cocked position and a firing position, wherein the rear bolt is configured to actuate the valve arrangement when the rear bolt moves from the cocked position to the firing position;

a drive spring configured to urge the rear bolt toward the firing position;

a firing assembly configured to selectively release the rear bolt in response to actuation of a trigger; and

wherein at least one wall of the receiver is movable with respect to one or more other walls of the receiver between an open position that opens the interior cavity to expose a top portion of the front bolt and a top portion of the rear bolt for servicing the marker and a closed position that blocks access to the interior cavity.

2. The paintball marker of claim 1 , wherein the wall that is movable with respect to the other walls extends longitudinally substantially the entire length of the receiver.

3. The paintball marker of claim 2 , wherein the wall that is movable with respect to the other walls longitudinally divides the receiver in the open position along a plane that intersects the front bolt and the rear bolt.

4. The paintball marker of claim 1 , wherein the wall that is movable with respect to the other walls pivots between the open position and the closed position.

5. The paintball marker of claim 4 , wherein the receiver has a front end from which the barrel extends and an opposing rear end, wherein the wall that is movable with respect to the other walls has a proximate end pivotally connected to the receiver in close proximity to the rear end.

6. The paintball marker of claim 5 , wherein the wall that is movable with respect to the other walls has a distal end adjacent to the barrel.

7. The paintball marker of claim 6 , wherein the distal end has an arcuate shape to form a substantially uninterrupted surface with the bore in the barrel.

8. The paintball marker of claim 5 , wherein the wall that is movable with respect to the other walls has a distal end with external threads that mate with internal threads of a fastener.

9. The paintball marker of claim 8 , wherein a flange extending from the barrel is received by the fastener to form an interference fit between the barrel and the receiver.

10. The paintball marker of claim 9 , wherein the flange is a snap ring.

11. The paintball marker of claim 1 , wherein the receiver includes spaced-apart side walls having a top portion and a bottom portion, an upper wall extending between the side walls on the top portion of the side walls, and a bottom wall extending between the side walls on the bottom portion of the side walls, wherein the side walls, upper wall and bottom wall define the interior cavity dimensioned to receive at least a portion of the valve arrangement and firing assembly.

12. The paintball marker of claim 11 , wherein the upper wall is movable with respect to the side walls between an open position that opens the interior cavity to expose the top portion of the front bolt and the top portion of the rear bolt and a closed position that blocks access to the interior cavity.

13. The paintball marker of claim 12 , wherein the upper wall pivots between the open position and the closed position.

14. The paintball marker of claim 13 , wherein the upper wall pivots about an axis that is approximately perpendicular to a longitudinal axis of the receiver.

15. The paintball marker of claim 12 , wherein a flange extending from the barrel is received by the fastener to form an interference fit between the barrel and the receiver.

16. The paintball marker of claim 11 , wherein the receiver has a front end from which the barrel extends and an opposing rear end, wherein the upper wall has a proximate end pivotally connected to the receiver in close proximity to the rear end.

17. The paintball marker of claim 16 , wherein the upper wall has a distal end adjacent to the barrel.

18. The paintball marker of claim 17 , wherein the distal end has an arcuate shape to form a substantially uninterrupted surface with the bore in the barrel.

19. The paintball marker of claim 16 , wherein the upper wall has a distal end with external threads that mate with internal threads of a fastener.

20. The paintball marker of claim 19 , wherein the upper wall extends substantially between the front end and the rear end of the receiver.