I had a feeling that BH209 would have problems getting listed as recommended. Pretty simple fix although its expensive.

Hankins HIS LRMP system is the cure but atm that also requires a new barrel too. IMO he would have a decent market to replicate a factory plug for those that only want to use subs. Each plug would either need to be rifle specific or the barrel would need machining. Those plugs last for ages though and only needs a bushing once its toast.