Sporterizing the M1903A4, Austrian Army Style

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That rifle on the very right is a prototype to the SSG 98k, the first Austrian post WWII sniper rifle. That features a pre-variant of the SSG 98k mount, which is basically a wingnut that clamps the split bottom ring on a dovetail (with a deciated step in the dovetail as end position and to hold against recoil, basically the same idea that was re-used for the Steyr SSG69). Later scopes have had a split top.

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Addendum, despite being from a different period, Austrian Army exhibition of Arms somewhen early post 1955. It was either 460 or 480 of M1903A4 sniper rifles they were given by the US government as aid post WWII.

Found another picture from the same place with other guns displayed, dated and location given. Therefore, this exhibition was at Truppenübungsplatz Döllersheim (nowadays "TÜPl Allentsteig) in 1957. That other picture shows MP M1 (Thompson), MP M3 (Grease Gun), MP40 (Schmeisser) and MP41 (PPSh41).