Dovetail rail
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A dovetail rail or dovetail mount can refer to several types of sliding rail system found on firearms, primarily for mounting telescopic sights. Colloquially, the term dovetail rail usually refer to any straight mounting bracket with an inverted trapezoid (dovetail) cross-section running parallel to the bore for mounting a scope or diopter sight to a rifle. These are sometimes also called "tip-off" mounts, and allow the user to easily take on or off the sight. Dovetail mount can also refer to a dovetail track running perpendicular to the bore.
A dovetail rail on a rifle receiver for mounting a sight (i.e. a scope or iron sights).
Left: Aimpoint Acro C2 reflex sight laying on its side. Right: Acro rail on a Picatinny riser.
A PSO-1M2-1 scope mounted on a VSS Vintorez
Side-mounted dovetail scope mount on a Romanian PSL rifle
SIG Sauer 200 STR
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The SIG Sauer 200 STR, also known as the SIG Sauer 200 STR Match, is a bolt-action rifle mostly used as a target/competition rifle for national competitions by Norwegian, Swedish and Danish sport shooters. It is a variant of the Sauer 200 TR or SIG Sauer 200 TR Match rifle that features thicker 19 mm (0.75 in) diameter barrels. The 200 STR is produced by J. P. Sauer & Sohn GmbH in Germany.
Espen Berg-Knutsen at Landsskytterstevnet in 2007 with a left handed Sauer 200 STR featuring a mirage band