Noise reducing booster insert

1. A noise reducing piston for a firearm sound suppressor booster configured for use with a firearm having a barrel, the piston comprising:

an elongated body defining a rear end, a forward end, a peripheral surface, and a longitudinal axis;

a central bore through the body extending from the rear end to the forward end and sized to allow passage of a projectile fired from the barrel;

internal threads adjacent the rear end of the body and configured to couple the body to the barrel;

a plurality of elongate gas vents disposed forward of the internal threads and extending from the central bore to the peripheral surface, each gas vent being linear and elongated only in a direction parallel to the longitudinal axis of the body; and

a plurality of indexing spokes disposed on the peripheral surface of the body forward of the gas vent and the gas vents permit expansion of gases accompanying discharge of the firearm into a space between the peripheral surface of the body and the sound suppressor, and wherein the internal threads are rotated for tightening in a first direction and side edges of the vents are angled in a corresponding direction such that expanding gases passing through the plurality of gas vents tends to rotate the body in the first direction and tighten the coupling between the body and the barrel of the firearm.

2. The noise reducing piston of claim 1 , wherein the plurality of gas vents are substantially equally spaced circumferentially around the peripheral surface of the body.

3. The noise reducing piston of claim 1 , wherein the plurality of indexing spokes are configured to retain the sound suppressor in a desired rotational orientation.

4. A sound suppressor configured for use with a firearm having a barrel, the sound suppressor comprising:

a sound suppressor body having a rear end;

a sound suppressor booster including a longitudinally slidable piston disposed in the suppressor body, said piston comprising:

an elongated piston body defining a rear end, a forward end, a peripheral surface, and a longitudinal axis;

a central bore through the piston body extending from the rear end to the forward end and sized to allow passage of a projectile fired from the barrel;

internal threads adjacent the rear end of the piston body and configured to couple the piston body to the barrel;

a plurality of elongate gas vents disposed forward of the internal threads and extending from the central bore to the peripheral surface, each gas vent being linear and elongated only in a direction parallel to the longitudinal axis of the piston body; and

a plurality of indexing spokes disposed on the peripheral surface of the piston body forward of the gas vent and defining an interior diameter of the sound suppressor booster; and

a spring disposed about the body of the piston and within the silencer body,

wherein the sound suppressor is configured to slide forward from a first position to a second position, compressing the spring, when a projectile is fired from the firearm and the gas vents permit expansion of gases accompanying discharge of the firearm into a space between the peripheral surface of the piston body and an interior surface of the suppressor body, and further wherein the internal threads are rotated for tightening in a first direction and side edges of the vents are angled in a corresponding direction such that expanding gases passing through the plurality of gas vents tends to rotate the piston body in the first direction and tighten the coupling between the piston body and the barrel of the firearm.

5. The sound suppressor of claim 4 , the piston body comprising a plurality of gas vents substantially equally spaced circumferentially around the peripheral surface of the body.

6. The sound suppressor of claim 4 , wherein the plurality of indexing spokes are configured to retain the sound suppressor in a desired rotational orientation.