| CPC F41A 21/36 (2013.01) [F41A 21/30 (2013.01); F41A 21/325 (2013.01); F41A 21/34 (2013.01)] | 20 Claims |

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1. An apparatus, comprising:
a body member comprising:
a barrel mounting end configured to mount the apparatus to a barrel of a firearm,
a muzzle end, wherein an axis of the body member extends from the barrel mounting end to the muzzle end,
a tube formed along the axis of the body member and connecting the muzzle end to the barrel mounting end, wherein a plurality of vents is formed in and around the tube of the body member, and
a receiving slot that is transverse to the axis of the body member, wherein the receiving slot is configured to retain a substrate in the tube during discharge of the firearm.
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