THE 209 ARE GREAT BUT I FOUND THEY DO BUILD UP WITH CARBON.I HAVE A T/C WITH A FLAME TROWER NIPPLE @ YOU NEVER HAVE TO CLEAN THE NIPPLE,DON'T CARE HOW MANY SHOT ARE FIRED.ALSO USEING A CCI MAG CAP.I JUST SWITCH BACK ON MY C.V.A TO NO#II NIPPLE,TO ME THE 209 IS A PAIN IN THE BUTT.