Suppressor thread gap

[HuntHarder]

My carbon 6 barrel's threads are longer than what my suppressor's female threads are. In other words, the can bottoms out on its threads, but there is still another 1/8" of exposed threads on my barrel. I have never ran into this issue, but feel like I should put some type of washer or crush washer there to make sure my suppressor has a firm and square stop. Is this common?

 

[huntsman22]

What can? What threads? SiCo ships a spacer washer with their rimfire cans for just that......

 

[SloppyJ]

Seems a bit off. I've never ran into this. It sounds like the threads are bottoming out on your first baffle and that's not good.

 

[mtnbound]

I have no experience with C6 barrels, but I have multiple cans, and none of them need a washer. Can you take your can apart and look at the inside of the mounting threads?

 

[Shortschaf]

sounds like your can's female threads didnt get finished all the way

 

[waspocrew]

Have you used this can before on a different rifle?

 

[pods8 (Rugged Stitching)]

Does it bottom out or it just gets to tight to thread more? If the latter it could just be thread tolerances clashing. I had to chase the threads on a barrel with a thread die to work with my can.

 

[Kimmo H]

Check if your muzzle thread has a relief cut at the end of the thread. If not, check if the suppressor has a relief cut at the start of the threads, so that the threads may go in all the way. The muzzle thread can't be cut all the way to the shoulder due to tool geometry, so there will be fitment issues is neither of the parts have a relief cut on them to make room for the end of the thread.

If you don't have a relief on either, the issue is that the thread cannot go in all the way, as the female thread ID hits the end of the muzzle thread before the shoulder makes contact.

You'll be best off having the relief cut done on one or the other half, so that you get solid metal to metal shoulder contact. Washers, especially crush washers are asking for trouble with suppressors, as a very slight misalignment will cause a baffle strike. A crush washer can get bent unevenly and cause severe issues.


Edit: And do not force the thread in all the way if it doesn't go to the shoulder with finger strength. Galling a muzzle device on a barrel is far from fun, and will be expensive to repair. Usually ends up with rethreading the barrel, and may cause irreversible damage to the suppressor aswell.