Suppressors Suppressor indexing on threads (vs muzzle or shoulder)

[MadKap]

Hi guys,

So I have a new 30p-1 can and a Remington 700 aac-sd.

I'm noticing that the 30p-1 is not really indexing on anything than the threads.

If you look at how the barrel is threaded, it's slightly wider at the base where the threading stops. This width, I believe, is thicker than the distance between the 30p-1's shoulder and where its threads begin. So basically, the suppressor is stopping maybe .5mm before it would actually index on the muzzle. Essentially, it's bottoming out on the threads.

That's not a chip out of the top of the barrel, just the light reflecting.


So is this a problem? Should I feel safe having the suppressor indexing like this? Do I need to get a new barrel?

Anyone else have this combo of suppressor and barrel?

It's strange because my other barrels actually have less material right at the bottom. They are basically undercut where the threads stop so this wouldn't be a problem.

 

[0311@LAR]

Yea, it looks like there is no relief cut where there should be. I don't have any experience with that particular rifle, but it doesn't look right. And it sounds like your other threaded barrels are done correctly, as the less material at the bottom of the threads is a relief cut, allowing your can to square up on the shoulder instead of the threads.

 

[MadKap]

Well I've been meaning to get into .260 at some point.

I'm just annoyed... my guess is that Remington threaded this guy to pretty much just work with aac cyclones.

Are new rem 700 aac-sd's threaded this way still?

 

[Shane C.]

You don't need to replace the barrel, just have it fixed. Putting a thread relief in is pretty easily done by a good smith.

If the can is not seating on the shoulder you will have an alignment issue leading to a baffle strike.

 

[cal50]

Have it machined to the proper AAC thread and dimension profile.


http://www.silencertalk.com/AAC-thread-guide.pdf

 

[Geno C.]

All of the 700aacs I've seen are threaded like this. I would absolutely not shoot my can without it seated firmly on the shoulder of the barrel. If you check out thunderbeasts website they have the thread spec that should be used and there needs to be a relief cut. That's your problem and it's not really that big of a deal to get fixed.