![]() If necessary, adjust the headspace by replacing the shim with one of appropriate size.Damper slip on the crank snout due to insufficient torque and tear up the key, the crank, and the damper? Twice.Re-check the headspace after installing the shim(s) to ensure it is still set correctly.Check the timing of the bolt to ensure it is correctly cycled.Secure the timing shim(s) using the appropriate screws or pins.Place the appropriate timing shim(s) between the barrel extension and the receiver.Secure the barrel extension using the appropriate locking screws or pins.Install the barrel extension, ensuring the barrel is correctly aligned with the receiver.Your desired headspace should be within the manufacturer-recommended range. This can be done by measuring the distance between the bolt face and the rim of a fired cartridge case. Ensure the barrel is correctly headspaced.Check the chamber of the gun to ensure it is clean and free of any debris.However, here are the basic steps of setting headspace and timing on a. It is not a job for the inexperienced and should not be attempted unless you have the correct tools and proper knowledge. 50 caliber firearm should be set by a qualified gunsmith. If you are uncomfortable or inexperienced with this procedure, it is best to seek professional help to ensure accuracy and safety. It is crucial to remember that checking headspace requires proper knowledge and expertise. ![]() If you are unsure about the headspace measurement or have concerns, it is recommended to consult a qualified gunsmith for further inspection and assistance.If the bolt handle rotates on both the "go" and "no-go" gauges, it may indicate excessive headspace. If the bolt handle rotates freely on the "go" gauge but not the "no-go" gauge, it indicates the correct headspace. Repeat the above steps with the "go" and "no-go" gauges separately if using them instead of a headspace gauge.If the bolt handle rotates freely without applying significant force, it indicates excessive headspace. With the headspace gauge(s) in place, slowly pull the bolt handle forward to fully close the bolt.Push the gauge(s) firmly into the chamber until they are fully seated against the bolt face.These gauges are specifically designed to check headspace. Insert a headspace gauge or a set of "go" and "no-go" gauges into the chamber.Inspect the bolt face for any signs of wear, damage, or excessive carbon buildup that may affect headspace.Remove the bolt from the rifle by pulling it all the way to the rear and then lifting it out of the receiver.Ensure the rifle is unloaded and that there is no ammunition present in the chamber or magazine.To check headspace on a bolt action rifle, follow these steps: Using the retracting slide handle, retract the bolt until the barrel-locking-spring lug is centered in the 3/8-inch hole on the right side of the receiver (Figure 3-18). Grasp the retracting slide handle (Figure 3-17). Use the following procedures to set headspace. Check and set headspace before firing, after assembling the gun, and after replacing the barrel or receiver group. NOTE: The headspace and timing gauge should be kept with the gun at all times.ī. These gauges provide an accurate means of checking the adjustment of headspace and timing. The headspace and timing gauge consists of a headspace gauge and two timing gauges (Figure 3-16). (The weapon has improper early timing when two rounds are fired - and firing stops.)Ī. This warning applies whether the gun is firing service ammunition or M1E1 blanks. Damage may also occur in the trunnion block, base of the barrel, or face of the bolt. Periodic calibration checks should be made of the gauge by direct support personnel at least annually.įiring a weapon that has improperly set headspace and timing could result in damage to the machine gun, or injury to the gunner. This occurs when the recoiling parts are forward and there is positive contact between the breech lock recess in the bolt and the lock in the barrel extensions. Because the cartridge is held by the T-slot of the bolt, headspace with the MG is measured as the distance between the rear of the barrel and the face of the bolt. Timing is the adjustment of the gun so that firing takes place when the recoiling parts are in the correct position for firing. ![]() Headspace is the distance between the face of the bolt and the base of the cartridge case, fully seated in the chamber.
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