Suppressor issue

Likely the wrong thread (clockwise instead of anti-clockwise).

 
Have you to see if it is infact a left or right hand thread? A quick visual check will confirm, failing that you can use your pinky nail to determine it (suppressor side)

 
It does go on a few threads without any issue. If it was wrong thread then surely it wouldnt go on at all. 

 
It does go on a few threads without any issue. If it was wrong thread then surely it wouldnt go on at all. 
Not necessarily as the metal used will be reasonably ‘soft’ so there is a chance it’s been cross threaded, which would cause a similar symptom as you are experiencing.

 
As above: In fact it's typical for it to go go one or two turns as normally they're tapered.

 
If you are very lucky then the thread damage will be limited to the female internal thread of the suppressor.

 
Dunno. As i said bit of lube on both threads. Gentle loosening and tightening and wrnt on after a while. Maybe gunked up threads 

 
If they're gunked up maybe get some rubbing alcohol (or failing that just some surface cleaner) and press a piece of kitchen towel into the threads then twist. Keep doing until the kitchen towel stops picking up black. Otherwise you're basically going to be rubbing metal shavings etc. into the threads every time you remove it, which isn't good. If you want a good, semi-permanent lube then copper grease is great for this sort of thing and won't dissipate like silicone.

 
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