How to remove a pinned and welded flash suppressor?

1. Make sure the firearm is unloaded.
2. Remove the magazine and clear the chamber.
3. Visually inspect the barrel to ensure that it is free of obstructions.
4. Place a block of wood or another sturdy surface on which to work on your gun, and place the firearm on its side with the bolt/slide assembly facing up.
5. Use a punch (or similar tool) to drive out the retaining pin that holds the flash suppressor in place.
6. Carefully remove the flash suppressor from the barrel and set it aside for later re-installation (if desired).
7. To install a new flash suppressor, reverse these steps, being careful not to cross-thread the suppressor onto the barrel.
8. Once the new flash suppressor is installed, make sure that the retaining pin is properly in place and secured.
9. Visually inspect the firearm to ensure that everything is back in its proper place and functioning as it should be.
10. Perform a function check on the firearm to ensure that it is functioning properly.
11. Re-assemble the firearm and load it as usual.

If you have any further questions, please consult your firearms manufacturer or a qualified gunsmith.