I have had two different designs of breach plug, they both work about equally well, the thing you will run into with all guns I know of that do really well with BH is that the carbon from the 209 does not escape it builds up between thespot where the end of the 209 sits and the flash hole. The answer to that is a 1/8 th inch drill; when you clean the gun and the breach plug clean the area where the fire comes out of the 209 on to the flash hole then take a hat pin or something similar and clear the flash hole, its not a problem unless you over look cleaning it. Lee