Swedish M38, Recessed rifling or counterbored?

[Sentryduty]

That looks exactly right, maybe it is just a cap. The one next to it had some sort of muzzle brake.

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[vintage hunter]

The one next to it had some sort of muzzle brake.

It may have been an aftermarket muzzle break/flash eliminator but it could've been a Swedish issue blank firing devise.
The Swede's used wood bulleted blanks for training so to eliminate the possibilities of someone being injured the muzzles of some rifles were threaded to accept the blank firing devise which shredded the bullets. Just be sure to remove it before firing live ammo or it will result in damage to the rifle and possibly the shooter or bystanders.

[André]

My M1896 has the muzzle thread (for use of the blank firing device) covered by a steel cap (which must be removed to fix the bayonet, BTW). It looks exactly like the pics above and without that protective cap, the rifling goes to the end of the bore. This is easy to verify by unscrewing said cap.