Timing, fastening, and sealing features for firearm gas blocks

1. A barrel assembly for a firearm, the barrel assembly comprising:

a barrel having a gas port and a taper interface, wherein the taper interface includes one or more sloped surfaces defined by part of an exterior of the barrel;

a gas block around the barrel; and

the gas block including a timing system including an opening and a tapered fastener insertable in the opening, the timing system configured to rotationally orient the gas block to position an ingress port of the gas block over the gas port, wherein the tapered fastener includes:

a length including a first tapered region arranged to lockup with the one or more sloped surfaces of the taper interface of the barrel, wherein the tapered fastener is configured to move along the taper interface and bias against the one or more sloped surfaces and the gas block to create the lockup; and

the length further including a second region to interface with the gas block; and

a drive mechanism for rotationally driving the tapered fastener into the opening.

2. The barrel assembly of claim 1 , wherein the length includes threading to engage with threading defined by a sidewall of the opening.

3. The barrel assembly of claim 1 , wherein the second region is tapered.

4. The barrel assembly of claim 3 , wherein the length that includes the first and second regions comprises a continuous taper.

5. The barrel assembly of claim 1 , wherein the gas block comprises an adjustable gas block include a rotationally actuated gas metering shaft.

6. A gas block assembly, comprising:

a gas block including a gas port to receive gas provided by a gas port of a barrel;

a tapered fastener including:

a length further including a tapered section configured to lockup with a taper interface defined by the barrel, wherein the taper interface includes one or more sloped surfaces defined by part of an exterior of the barrel, and wherein the tapered fastener is configured to move along the taper interface and bias against the one or more sloped surfaces and the gas block to create the lockup; and

a drive mechanism for rotationally driving the tapered fastener into an opening.

7. The gas block assembly of claim 6 , wherein the driving mechanism is located on an end of the tapered fastener, and wherein an opposite end of the tapered fastener includes an additional section arranged to mate with a groove defined by the barrel.

8. The gas block assembly of claim 7 , wherein the groove comprise a V-slot.

9. The gas block assembly of claim 6 , wherein the gas block comprises an adjustable gas block that is adjustable using a rotationally actuated gas metering shaft.

10. The gas block assembly of claim 9 , wherein a smooth length of the gas metering shaft includes a groove and one or more ring(s) located in the groove to provide a metallic labyrinth seal with a bore of the adjustable gas block.

11. An apparatus, comprising:

an adjustable gas block including:

an ingress port to receive gas expelled from a gas port located on a barrel; and

a rotationally actuated gas metering shaft drivable in a threaded section of a bore of the adjustable gas block to at least partially cover the ingress port with the gas metering shaft to restrict a flow of the gas, wherein the gas metering shaft includes a section to form a seal with a smooth section of the bore in a range of selectable positions of the gas metering shaft from maximum gas flow restriction to minimum gas flow restriction, the section of the gas metering shaft including a groove and a gas seal located in the groove;

wherein the bore is continuous such that the smooth section directly transitions to the threaded section;

wherein, when the gas metering shaft is rotated in the threaded section, the seal of the gas seal is maintained until the gas seal reaches the threaded section is reached.

12. The apparatus of claim 11 , wherein the gas seal comprises a metallic seal.

13. The apparatus of claim 11 , wherein the gas seal comprises a laminar gas seal.

14. The apparatus of claim 11 , wherein the gas seal comprises a metallic split ring.

15. A firearm including the apparatus of claim 11 .