98 or Pre-98:

Since some of the military spotting features can be changed, one of the most reliable methods is to look at the rear of the bolt.

The 98 bolt rear is larger diameter than the rest of the bolt body, and there is a safety lug on the bottom. The pre-98 bolt is the same diameter at the rear and there is no safety lug. In the photo, the 98 bolt is on the left.

Bruce

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