What do you mean you didnt know?...You typed this the other day.
has come out with a new breech plug for all bare primer bolt guns that use bare primers it's supposed to eliminate all the problems associated with the knight plugs such as sticking primers and they have a replaceable vent liner
If i go to order the Bare 209 conversion with the part# you listed off the website. I get just under $107 shipped. The Mountaineer bare primer conversion is $119 plus shipping.
Actually the Lehigh NFPJ bolt adapter should fit a Mountaineer FPJ bolt too. The old Lehigh plug is just too short for a Mountaineer. The old plugs were only for Elites/Extremes or converted DISC Originals.