I think it would be a great advancement of the 700ML design, if Lehigh Dave could make a good fix for those that do not have the machine capability to do it themselves. I say go for it! I posted some photos of the breach plug mod I did to one, they are in the Last pages of the sticky BP thread.

IMHO,The current crop of 209 Kits that I see for sale are a small start to fix the real problem. I thinks that the bolt along with the BP have to be fixed. IMHO, The stock firing pin is nothing more than a plunger hidden inside a rem 700ml bolt. To fix the problem the 209 has to be held in place by more than just firing pin spring pressure.

I thinks the best fix/kit would be a new firing pin along with a press in bolt end that holds the 209 in place, along with the appropriate Breech plug. Because the 209 shell holder type bolt end is patented by Henry and Bill Ball, then a Kit featuring that would need licensing.

A bolt end that was flat with the small firing pin hole that tightly holds/presses the 209 into a proper sized and spaced breach plug would be just right for solid performance. Being the 700ml was a production line gun then the dimensions would be easy to do, for proper fit of them.