Made this one out of alum. You have to put on your existing O ring in the groove provided. The actual stripper is a cone made of alum, and it is removable in case I wanted to move it to another gun of different caliber. However, never got around to moving it; and now don't need it. It is longer than stock stipper, so the last baffle has to be trimmed a little to make it fit. I will include the 4 stock baffles and one of them has been trimmed to size to allow the stripper to fit. It is a press fit onto stock barrel and is sized for .25
$30 shipped to conus.