Designed to work in conjunction with the hooded front sight, the Rotary Diopter Sight System attaches to the receiver's M1913 rail.
What does D stand for?
D stands for Diopter (unit of optical power)
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We have 1 other meaning of D in our Acronym Attic
Samples in periodicals archive:
Sig Sauer, a leader in commercial, law enforcement, and military firearms manufacture, has introduced a rotary diopter sight system that is optimized for the SIG 556 rifle and provides serious shooters with a high-quality set of iron sights with CQB capabilities.