First let me just say that I'm personal friends with the man that invented and created that ignition system, Ken Johnston at Ultimate Firearms Inc. Remington purchased the rights to use the ignition system from Ken. I know the rifles well.
I've replaced 4 breech plugs, all from being gas cut nipples and yes they will gas cut. Once they gas cut, you're done until you get a replacement. But then of course, you still have to deal with PP head space and even worse, PP primer carriers. That brass that Remington pawns off can have a head thickness that varies up to .020" and I can assure you, there's no way to properly seal that brass on that nipple with that kind of brass.
Remington tried to harden up the breech plug nipple to help, but they still will end up gas cutting, rather using the recommended propellants, and especially BH209. Its not if, but when. BH209 was never approved by Remington, nor was it listed in the owner's manual.
Without question or hesitation, if you plan on shooting BH209 from your RUM purchase the Arrowhead system. Why on earth would you replace a primitive breech plug with another primitive breech plug and go through the same process over and over? You do know that they say that is the definition of insanity
Dad (R.I.P.) always used to say:
"If you don't have the money or time to do it right the first time, where will you get the money and time to have to do it over?"
The Arrowhead ignition system will give you a lifetime of proper ignition and without any leaking or gas cutting. You can shoot all the BH209 you want to shoot and never worry about gas cutting, or having the ignition system fail on you while on a hunt of a lifetime. THAT my friend, makes the Arrowhead ignition system priceless in itself!
DO IT!