Rifle barrel having muzzle device with access ports

1. A barrel assembly for a rifle comprising:

an elongated barrel having an exterior surface, an interior cylindrical bore defining a caliber, a muzzle with a crown, and a rear end with an enlarged cavity capable of receiving a round of ammunition;

an elongated muzzle device permanently attached to the exterior surface of the barrel and surrounding and extending past the crown, the muzzle device including a longitudinal opening coaxial to the bore and one or more access ports positioned adjacent to the crown, such that the crown is located radially inward relative to the one or more access ports;

a sleeve slidably mounted to an exterior surface of the muzzle device and capable of sliding between an open position and a closed position;

wherein, when the sleeve is in the open position, the crown is accessible through the one or more access ports; and

wherein, when the sleeve is in the closed position, it seals and completely covers the one or more access ports.

2. The barrel assembly of claim 1 , wherein the muzzle device possesses a length that is at least equal to a length of the elongated barrel.

3. The barrel assembly of claim 2 , wherein the barrel assembly has a total length at least 16 inches.

4. The barrel assembly of claim 3 , wherein the total length of the barrel assembly is between 16 and 18 inches.

5. The barrel assembly of claim 4 , wherein the muzzle device is a barrel shroud.

6. The barrel assembly of claim 5 , wherein the elongated barrel is formed of stainless steel and the muzzle shroud is formed of aluminum.

7. The barrel assembly of claim 1 , wherein the muzzle device further comprises threading on its exterior surface, wherein the sleeve further comprises threading on an interior surface, and wherein when the sleeve is in the closed position, the muzzle device's threading engages the sleeve's threading to form a first seal.

8. The barrel assembly of claim 7 , wherein the muzzle device further comprises a flange on its exterior surface, wherein the sleeve further comprises a flange on its interior surface, and wherein when the sleeve is in the closed position, the muzzle device's flange engages the sleeve's flange to form a second seal.

9. The barrel assembly of claim 1 , further comprising a detent clip adapted to restrain the sleeve when it is in the closed position.

10. A barrel assembly for a rifle comprising:

an elongated barrel having an exterior surface, an interior cylindrical bore defining a caliber, a muzzle with a crown, and a rear end with an enlarged cavity capable of receiving a round of ammunition;

an elongated muzzle device permanently attached to the exterior surface of the barrel and surrounding and extending past the crown, the muzzle device including a longitudinal opening coaxial to the bore and one or more access ports positioned adjacent to the crown, such that the crown is located radially inward relative to the one or more access ports;

a sleeve slidably mounted to an exterior surface of the muzzle device and capable of sliding between an open position and a closed position;

one or more removable shims configured to fit between the muzzle device and the sleeve and substantially cover the one or more access ports;

wherein, when the sleeve is in the closed position, the removable shims substantially cover the one or more access ports, and the sleeve seals and completely covers the one or more removable shims and the one or more access ports.