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A designated marksman rifle (DMR) is a modern scoped high-precision rifle used by infantry in the designated marksman (DM) role. It generally fills the engagement range gap between a service rifle and a dedicated sniper rifle, at around 300–600 metres (330–660 yd).
DMRs are distinguished from sniper rifles in that they are semi-automatic to provide higher rates of fire (with some also having selective fire to switch to burst or automatic) and have larger magazine capacities (10, 20, or 30 rounds depending on the firearm and operational requirements) to allow rapid engagement of multiple targets.
DMRs have to be effective, in terms of hit rates and terminal ballistics, at application ranges exceeding those of ordinary assault rifles and battle rifles, but do not require the extended-range performance of a dedicated sniper rifle. DMRs need to function as part of squad (and possibly at close quarters) and often share some basic characteristics with sniper rifles when compared to other weapons carried in the DM's platoon. They typically have telescopic sights for more detailed observation and aiming, often also quick-deployed bipod for optimized accuracy, reduced recoil and better stability, and an adjustable stock for better ergonomics.