Suppressors Minimum barrel diameter for a suppressor

[Burleyboy]

I'm thinking about building a shorty 308 and having it threaded for a suppressor with plans on
Picking one up down the road. I'd like to keep it on the lighter side so what diameter at the muzzle can I go down to and still have enough shoulder to tighten up against? I don't want to run any special adapters or threading.

Bb

 

[Graham]

#4 contour

 

[rancilio]

Assuming you thread to 5/8, your threads will be 0.625in. I prefer a minimum diameter of a penny, 0.75in., as a convenient measure to ensure a shoulder. As a norm though, I'd rather have a heavy varmint or greater diameter, generally 0.80in or larger.

 

[rmfield]

I have a #5 (.735") with 5/8"x24 threads and I consider it to have just barely enough shoulder for a suppressor.

TBAC recommends .75 and says .70 absolute minimum.

 

[srt-4_uk]

You can use any barrel really. If it's too small for a shoulder, can't you just make an adapter with a larger shoulder that indexes off the muzzle?

 

[BigNoise]

Don't know if anyone has done it, but I've thought about it for a future build.....have your barrel maker turn custom contour, with a wider muzzle.

 

[srt-4_uk]

The Rem Micro 7 has that kind of profile as well as the ER Shaw 16" 300blk barrel and the H&R Handi Rifle in 300blk.

 

[WTW]

I have a Model 70 with a BOSS on the end. I had someone turn an adapter for the 9/16 threads that are on it. The adapter has enough of a shoulder that is should be able to accept a 5/8-24 can. Just waiting for the stamp to come back.