Have a brand new Knight Disc Extreme with the FPJ in which I would like to try BH209. Seems the skinny for this is to convert to bare primer with these Lehigh products. I have a couple of questions for you guys (and gals?). Does the primer adapter mount on the front of the stock Knight bolt? I ask because Knight seems to sell a completely different bolt for their conversion. and What is the function of the Lehigh vent liner? Also, I read about some headspace problems. Are headspace or other problems normally associated with other brands of conversions?For those of you that might be interested Lehigh Dave is back offering conversion parts - 17-4 breech plugs, primer adapters and Vent lines...