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mrad
A milliradian, often called a mil or mrad, is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0.001 radian). Mils are used in adjustment of firearm sights by adjusting the angle of the sight compared to the barrel (up, down, left or right). Mils are also used for comparing shot groupings, or to compare the difficulty of hitting different sized shooting targets at different distances. When using a scope with both mil adjustment and a reticle with mil markings (called a mil/mil scope), the shooter can use the reticle as a "ruler" to count the number of mils a shot was off target which directly translates to the sight adjustment needed to hit the target with a follow up shot. Optics with mil markings in the reticle can also be used to make a range estimation of a known size target, or vice versa to determine a target size if the distance is known, a practice called "milling".
Milliradians are generally used for very small angles, which allows for precise mathematical simplifications to more easily calculate back and forth between the angular separation observed in an optic, linear subtension on target and range. In such applications it is useful to use a unit for target size that is a thousandth of the unit for range, for instance by using the metric units millimeters for target size and meters for range. This coincides with the definition of the milliradian where the arc length is defined as 1/1000 of the radius. A common adjustment value in firearm sights is 1 cm at 100 meters which equals 10 mm/100 m = 1/10 mil.
The true definition of a milliradian is based on a unit circle with a radius of one and an arc divided into 1000 mils per radian, hence 2000π or approximately 6283.185 milliradians in one turn, and rifle scope adjustments and reticles are calibrated to this definition. There are also other definitions used for land mapping and artillery which are rounded to more easily be divided into smaller parts for use with compasses. For instance there are artillery sights and compasses with 6400 NATO mils, 6000 Warsaw Pact mils or 6300 Swedish "streck" per turn instead of 360° or 2000π, achieving higher resolution than a 360° compass while also being easier to divide into parts than if true milliradians were used.
Up for sale is a Vortex PST Gen I 6-24 EBR-2C FFP MRAD. Been on the rifle for 2 years, still in near perfect condition. Comes with a lot of shims. Also comes with Butler Creek rear flip cap, and Vortex Switchview magnification lever. No front cap. $400 firm. Not looking for trades unless it’s a...
Tikka T3x CTR Stainless 6.5 Creedmoor 20” with threaded barrel. Tikka Performance 20 moa rail and pineapple bolt. Vortex Viper Gen 2. 5-25x50 illuminated Mrad. Vortex Precision Matched Rings and defender flip caps. Right around 200 rounds fired with proper break in. Gun is sub MOA all day long...
Brand new with box, never mounted. Just took it out to check it out. Had a few unexpected expenses come up and its forcing me to sell my new optic. Its literally brand new in spectacular new condition. And has everything that came in the box. $1200 shipped OBO
This is a new in box Vortex Viper PST 4-16x50 First Focal Plane scope with miliradian reticule and adjustment turrets. It has never been mounted, only pulled out of the box for pictures. This is an awesome scope, with excellent clarity, and will serve someone very well. $650 takes it home. Buyer...
SOLD
This is a Sig Sauer Tango 4 3-12x42 First Focal Plane scope with Miliradian reticule and adjustment turrets. It is in like new condition, only having been mounted and shot a handful of times. Included is a set of Butler Creek flip caps, the original box with documentation, packaging, and...
HARRISBURG/ EUGENE
Selling a Razor AMG 6-24 in MRAD.
This has a clean bill of sale straight from Vortex. Has some signs of use (pictured) but are only surface level scratches from shooting matches. No indentations what-so-ever.
This scopes are amazing and only reason I’m selling it is because...
Vortex Viper PST Gen II 5-25x50 Riflescope FFP MRAD EBR-2C for sale at $900
Upgraded to a Vortex Razor HD.
Been a great scope. Comes with the original box and paperwork and Vortex' amazing lifetime warranty. Has lived on my Bergara B14 HMR this year and has performed flawlessly for my 600 yard...
Selling my Vortex Viper PST 2.5-10x32 FFP MRAD scope WITHOUT the ADM recon mount for $600
Comes with the original box and paperwork with the brass zero-stop shims and Vortex' amazing lifetime warranty. Has lived on my BCM 16" middy for the last couple years and has performed flawlessly but I...
I wanted to try out each of the new DB FFP scopes and I ordered one extra of each.
1. Vortex Diamondback Tactical FFP 6-24x50mm, FFP, MRAD, EBR-2C (brand new in box)
includes sunshade, new high quality rubber scope bikini, and lens cloth
-asking $365 shipped
2. 1. Vortex Diamondback Tactical...
Received this scope in a trade and ended up not using it, hoping to find a loving home for it!
Vortex Viper PST 4-16x50 EBR-1 (mrad reticle)
There is a small blemish on the bottom of the optic but other than that it is essentially new.
Comes in original packaging and includes sun-shade...