Barrel mounting system

1. A barrel mounting system to mount a barrel to a barrel mount of a firearm body, the barrel mounting system comprising:

a mount receiver secured to a barrel mount, the mount receiver including axial channels and receiver threads disposed on an interior facing surface;

a barrel sleeve disposed around a barrel proximal to a proximal end of the barrel, the barrel sleeve including sets of sleeve threads disposed near a proximal end on an exterior facing surface and sized to slide through the axial channels and, when rotated, to engage the receiver threads;

a sleeve insert, the barrel sleeve including internal threads to engage the sleeve insert; and

a barrel collar disposed around the barrel and secured to the barrel and to limit an axial position of the barrel sleeve.

2. The barrel mounting system of claim 1 , further comprising a mounting nut, the mounting nut securing the mount receiver to the barrel mount.

3. The barrel mounting system of claim 1 , wherein the sleeve insert is to engage a flange or diameter change of the barrel, an axial position of the sleeve insert adjustable to adjust a relative axial position of the barrel sleeve and the barrel.

4. The barrel mounting system of claim 1 , wherein the barrel sleeve further includes a set screw to secure the sleeve insert in the barrel sleeve.

5. The barrel mounting system of claim 1 , wherein the barrel sleeve includes pins or detents extending from a distal surface facing a distal end of the barrel.

6. The barrel mounting system of claim 5 , wherein the barrel collar includes slots or grooves to engage the pins or detents of the barrel sleeve.

7. The barrel mounting system of claim 1 , wherein the barrel sleeve further includes a slot to permit a gas tube, rod, or piston to pass through the barrel sleeve.

8. The barrel mounting system of claim 7 , wherein the slot allows the barrel sleeve to rotate while the gas tube, rod, or piston remains in a fixed position.

9. The barrel mounting system of claim 7 , wherein the mount receiver includes a hole to permit the gas tube to pass through the mount receiver.

10. The barrel mounting system of claim 7 , wherein the barrel collar includes a groove to permit a gas tube to pass over the barrel collar.

11. The barrel mounting system of claim 1 , wherein the barrel sleeve further comprises exterior facing threads disposed at a distal end of the barrel sleeve.

12. The barrel mounting system of claim 11 , wherein the exterior facing threads of the barrel sleeve are to engage a handguard.

13. The barrel mounting system of claim 1 , wherein the mount receiver includes a rail feature.

14. The barrel mounting system of claim 1 , wherein the mount receiver includes an alignment feature to align the mount receiver with a firearm body.

15. The barrel mounting system of claim 1 , wherein the mount receiver includes a physical stop to limit rotation of the barrel sleeve.

16. The barrel mounting system of claim 1 , wherein the barrel sleeve further includes a locking mechanism to engage a locking feature of the mount receiver to limit counter rotation of the barrel sleeve.

17. The barrel mounting system of claim 16 , wherein the barrel collar further includes a set screw to secure the barrel collar to the barrel.

18. The barrel mounting system of claim 1 , wherein the sets of sleeve threads include 2 to 12 threads.

19. The barrel mounting system of claim 1 , wherein axial channels to receive adjacent sets of sleeve threads are offset by different angles.