I did a barrel swap on my pc carbine swapped out the .308 barrel with a LW .243 barrel the swap went easy pipe wrench, cheater bar and one whack with a dead blow hammer and the nut came right off I did soak it down with kroil oil over night.
My hard part is fitting the new recoil lug into the accu stock I'm having to relieve alot of metal in front of the recoil lug area and I don't see that wedge will fit any more.
In all the reading I did prior to the swap I never read anything about fitting a new barrel and lug into a accustock.
I will post a pic when done if anyone wants to see it.