could have tip of the barrel threaded for a flash suppressor
You would need to have the barrel cut, re-crowned, and then threaded. There is not enough room (as memory serves-sold mine last year) ahead of the front sight to thread it...
If that's your goal, I'd suggest selling it- and getting a newer tactical model with the flash suppressor.
The newer models with the heavier barrels are more accurate than those of old...and by the time you spend the money to have a smith do the necessary work, and buy a flash hider for it- you'll have far more money into the gun that it's worth.