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radian

The radian is the standard unit of angular measure, used in many areas of mathematics. The length of an arc of a unit circle is numerically equal to the measurement in radians of the angle that it subtends; one radian is just under 57.3 degrees (expansion at A072097). The unit was formerly an SI supplementary unit, but this category was abolished in 1995 and the radian is now considered an SI derived unit.
Separately, the SI unit of solid angle measurement is the steradian.
The radian is represented by the symbol rad. An alternative symbol is c, the superscript letter c (for "circular measure"), the letter r, or a superscript R, but these symbols are infrequently used as it can be easily mistaken for a degree symbol (°) or a radius (r). So, for example, a value of 1.2 radians could be written as 1.2 rad, 1.2 r, 1.2rad, or 1.2c, or 1.2R.

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Recent contents
  1. M

    Radian ambi safety

      1. For Sale
    • $30
    • Keizer
    • Oregon
    Used radian ambi safety no springs or detents if you already have an ar your springs and detents will work the same for this safety. No shipping Questions in comments Offers in PM
  2. Remington96

    Radian Ramjet for Glock 19/45 Gen 5

      1. For Sale
    • $290
    • Tualatin
    • Oregon
    Round count is below 500. In overall great shape Looking for $290. Willing to ship
  3. 1775usmc

    Glock 19 Gen 5 with Ramjet/Afterburner

      1. For Sale
      2. For Trade
    • $625
    • Tualatin
    • Oregon
    Glock 19 Gen 5. All stock. Milled for RMR footprint. Does not have iron sights installed. Brand new Radian Ramjet/Afterburner. Will come with 3 mags, box, and Radian packaging. SNs do not match (G45 slide and G19 frame) as I built this on a frame I already had. I will throw in a set of Haley 13...
  4. 1775usmc

    WTB Radian Ramjet/Afterburner

      1. Want to Buy
    • Tualatin
    • Oregon
    Looking for a used Radian Ramjet/afterburner for a G19 Gen 5 for a project I am working on. Looking here before I buy new. Max I’ll spend on a used one is $300 and that would be for one in great condition. Thanks.
  5. 1775usmc

    Glock 17 Gen 5 slide complete

      1. For Trade
    • Tualatin
    • Oregon
    Glock 17 Gen 5 slide complete. All OEM internals. With night sights. I believe ameriglo. Will trade for a Radian Ramjet/afterburner for a Gen 5 G19. Also may be interested in a PMM micro comp set up for a Gen 5 G19 as well. Can add cash depending
  6. S

    Radian Model 1

      1. For Sale
      2. For Trade
    • $2200
    • Albany
    • Oregon
    Radian Mod 1 14.5in Centurion Dimpled RECCE barrel (Less than 100 rnds) Radian BCG Radian Charging handle Radian Safety Magpul stock H2 Buffer/Geissele braided spring SLR Buffer tube Want to trade for a Staccato P HD 4.5, S&W M&P HD Steel frame (no thumb safety), or Steel Frame PDP 5in...
  7. yelchdima

    P365 x macro radian magwell

      1. For Sale
    • $100
    • Battle Ground
    • Washington
    Radian magwell for a p365 x macro changing up my ccw build. Just a few months old.
  8. yelchdima

    P365 X-Macro grip module, Radian Magwell, Tlr-7x sub, G-Code iwb holster

      1. For Sale
    • $250
    • Battle Ground
    • Washington
    Going a different route with my sig build. All almost new!! 3 months old X macro coyote grip module - 1 mag 10rd $60 Radian magwell $100 Streamlight tlr-7x sub light $100 G-Code IWB holster $40 Everything $250
  9. XodusEC

    Glock 19/23 gen 4 Radian Afturburner Optic Ready

      1. For Sale
    • $800
    • Lebanon
    • Oregon
    Gen 4 Glock 23 with 19 slide and barrel. The whole package consists of the Glock 23 parts a Zaffiri RMR cut 19 slide, suppressor height sights, Radian Ramjet and Afterburner, 1 threaded 9mm barrel and a regular 9mm match barrel. The radian set up probably only has 2-300 rounds on it. No trades.
  10. dmmv

    Radian Model 1 (new)

      1. For Sale
      2. For Trade
    • $2500
    • NW Portland
    • Oregon
    Brand new, factory complete Radian rifle chambered in 223 Wylde (.223 or 5.56). Beautiful rifle with a 17.5" barrel, radian brown in color. Considering trades for: MK5 HD scope in mil CZ shadow 2 compact and/or carry Radian ramjet gen 5 (19 or 17) Maybe an SP-01 Marlin SBL .44 Beretta a300...
  11. D

    PWS Radian Raptor LT

      1. For Sale
    • $70
    • Boise
    • Idaho
    PWS Radian Raptor LT, black.
  12. CoolBreeze808

    Radian Raptor Charging Handle **Sale Pending

      1. For Sale
    • $60
    • Portland
    • Oregon
    For AR15 - used. Price is firm, not interested in trades. Meet by Mall 205 in Portland or off of 212 and SE 82nd in Clackamas depending on time. Thanks for looking!
  13. C

    Aero M4E1 Complete Lower with Geissele Super Dynamic Combat Trigger and SB Tactical HPDW Brace

      1. For Sale
    • $500
    • Happy Valley
    • Oregon
    Selling one of my spare lowers. Lower and buffer system seen about 500 rounds suppressed and unsuppressed. Aero Precision M4E1 Geissele Super Dynamic Combat Trigger Radian Talon Safety (Ambi) Radian Takedown Pins Battle Arms Development Mag Catch and Bolt Catch SB Tactical HPDW Brace Driven...
  14. B_Cannon

    Radian ADAC-15 Lower

      1. For Sale
      2. For Trade
    • $850
    • Eugene
    • Oregon
    Lightly used Radian ADAC. Forward Controls Design RE5F, CNF, and ESF (FCD castle nut, end plate, and A5 length buffer tube). Geissele Super 42 rifle length spring. BCM MK2 T2 buffer (A5 H2 buffer equivalent), Geissele SSA-E X trigger. Everything in the photo EXCEPT for the DFCO grip is...
  15. S

    New Glock 43X MOS build

      1. For Sale
    • $1355
    • beaverton
    • Oregon
    Hey guys, built this Glock 43x. I never used it because I still prefer my 365. Can send additional photos if needed. PRICE IS SEMI FIRM:) NO TRADES Not dying to get rid of this, so I can wait for the asking price. Can sell without the Afterburner + ramjet (-389.95) WILL NOT SELL WITHOUT HOLSTER...
  16. Ranger Walker

    Radian ramjet + afterburner

      1. For Sale
    • $300
    • Albany
    • Oregon
    Selling my Radiant ramjet and afterburner combo. Lightly used, I estimate 300-400 rounds. Mounted a few times in a G19 and G45 to try out. Gen 5 $300.00 Can meet with in Clackamas one day a week, open to shipping if you cover costs. Will meet nearby to Albany
  17. JR-15

    Daniel Defense DDM4v7s 556 AR

      1. For Sale
    • $1000
    • Beaverton
    • Oregon
    Hello- Selling my 11.5" AR Pistol. This is a complete Daniel Defense factory DDM4v7s lightweight upper receiver, with the following furniture/parts: Aero precision M4E1 stripped lower Geissele SD3G competition trigger Radian raptor charging handle and their ambidextrous Talon saftey selector...
  18. daviddex5832

    Radian Model 1, 6mm ARC, Proof Research, JP Rifles

      1. For Sale
      2. For Trade
    • $2000
    • Tualatin
    • Oregon
    Parting ways with my Radian Model 1 in 6mm ARC, built this from a builders kit and threw in some of the best parts I could get my hands on. Has maybe 200-300 rounds on it, runs very well so far. Feel free to ask any questions about the build, I absolutely love this rifle but life happens...
  19. Tht_guy_josh

    WTB A5 BUFFER SET UP and 43x magwell

      1. Want to Buy
      2. Want to Trade For
    • salem
    • Oregon
    Looking to buy an entire set up if possible. Will definitely need a a5 tube and a3 buffer Also looking for a radian 43x magwell or sheild arms magwell And a melonite mid length gas tube
  20. 1775usmc

    AR small parts bundle

      1. For Sale
    • $50
    • Tualatin
    • Oregon
    What you see is what you get. I’ll trade for G19 or G17 Gen 5 mags or a Kagwerks Gen 5 slide release.
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