Most of the late group of Milsurp Swedish Mausers imported have had threaded muzzles. It was to attach a training device that allowed the use of wooden bullets for training. The device would shred the bullets upon exiting the muzzle,

Here's a photo of the device...



A quick explanation..

http://www.ar15.com/archive/topic.html?b=6&f=14&t=386434


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