Muzzle reference system

A muzzle reference system (MRS) is a device used on most modern tank guns and some artillery systems that measures the bending of the barrel due to heat, gravity and other issues.

It normally consists of a laser device and detector mounted at the breach end of the gun, often co-located with other optics like the gunner's sight, and a mirror at the muzzle.

By measuring the deflection of the barrel, corrections can be applied by the ballistic computer to correct for changes as the gun is fired.

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