Those sliding from the front have 6mm dovetails.
The early 640 (and Sako's high-power, Brno 21, 22) have the same dovetail as the military M/96, so it's easy to find a replacement (5.25mm) since the Swedish military used 12 different heights for their M/38.
Most of the 1600/1640 familly have the standard 3/8" dovetail.
The early 640 (and Sako's high-power, Brno 21, 22) have the same dovetail as the military M/96, so it's easy to find a replacement (5.25mm) since the Swedish military used 12 different heights for their M/38.
Most of the 1600/1640 familly have the standard 3/8" dovetail.
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