Mounting a flash hider? I like women myself, but it's a free country. :goof:
Is there a sleeve around the end of your barrel? If so it's probably covering up the threads. I had one on my NHM-91 and a little Dremel action got rid of it.
If there is no sleeve then you will need to thread the barrel.
if its not threaded(it may be covered!) then you will need to thread it. im not sure if you have one that has shaved lugs, if thats the case you will need a 28x1 thread? i think... i dont remember that one as i dont use it. i have a 14x1 lh tap and die, and it works great. you'll need to get you one of those.