I recently acquired a 2003 huntsman .50 cal. It still had the factory breech plug that required the orange discs. After some research I purchased PR's 209 direct fit breech plug ⅞" for the NEF huntsman. From what I've heard its a "plug and play" plug. The new plug installed as it should. It appears to be setting at the correct depth. I went out today to test it out... 209 primers don't fit in the 209 direct fit breech plug. I couldn't get the primer past the rounded edge (not the flange, the rounded edge at the bottom of the primer). They're NSI primers. I don't dare get rough with it. I like my fingers the way they are. Anyone else dealt with this? I intend on getting a hold of Cecil.