Not sure if this is the right section, but here goes.......
Rifle is a Browning X-Bolt in .223 rem, I bought it just under a year ago and quite like it, with a few provisos.
The moderator I chose is a bit heavy although very efficient, a Pess T12.
Factory thread is 14x1 metric fine, not very well done, and in my opinion too big a thread for the barrel diameter which is 15.1mm at the thread shoulder.
I had been thinking of getting a lighter muzzle mounted can, weight is the main issue, as long as it makes it a little quieter than no can I'd be happy, and if it ends up about the same as my unmoderated .22 hornet i'd be ecstatic.
However from what I can see the thread could not safely hold, or align a muzzle mounted can due to a lack of shoulder.
Another thing is the mod has always loosened off after a few shots, and never feels right when you do it up, it does not go down tight and lock, just gets tighter, almost feels like it would strip if tightened further.
Thread in the moderator is fine, and tightens down on a mates T3 as it should.
In the pic you can see how badly the shoulder is formed, and having looked at a couple more X-bolts in .223 mine is not the only one to suffer this problem.
Now next Friday I am having my Hornet barrel threaded by Brock & Norris, the thread will be 1/2 x 20, is it worth having the X-bolt done the same, at the same time ?
If I do I won't have a moderated rifle at all, till I can find the cash to buy a new mod, although I will have a Pess T12 in 14x1mm going spare.
I only have one spare slot for a moderator, so it would be nice if the new mod does both rifles, although it is far more important that it suits the hornet, all it has to do on the .223 is survive and take the worst of the bang away.