Patent ID: 7997260

Claim:
A marker comprising: an outer member having an opening disposed generally axially therethrough and a gas inlet passage; a sleeve slidingly received within said outer member and configured to move between a first position and a second position, said sleeve being closer to a muzzle end of the marker in said second position than in said first position; a first chamber at least partially defined between said outer member and said sleeve, said first chamber being in flow communication with said gas inlet passage when said sleeve is in said first position and in said second position; a second chamber at least partially defined within said sleeve; and a passageway disposed between said first chamber and said second chamber, said passageway being sized with respect to said gas inlet passage so as to impede said gas entering said first chamber from entering said second chamber at least when said sleeve is moving from said second position to said first position; and wherein said second chamber is in flow communication with said first chamber at least when said sleeve is in said first position.