Yes, the lock ring between the booster and jacket may be staked into a square notch in the jacket. Make sure you bend it back out of that notch first. It may also be staked in a round notch on the booster, but you usually don't need to bother with that until after the booster is removed. If reusing this lock ring, you may have to free it up at that spot too. If you need a new ring, contact Dan @ Angola Armory, here on the board. Good Luck!