TEXT:  
  d20 Modern (and d20 Future) contains a wide 
  variety of weapons. If you add in books like 
  d20 Weapons Locker, and the d20 Modern 
  version of  Ultramodern Firearms from Green 
  Ronin Publishing, by Charles Ryan, you’ll find 
  literally hundreds of real-world weapons 
  weapons ready for use in your WOIN game 
  with just a little conversion.  
     d20 Modern gear is very easy to convert. It 
  only takes about 10 seconds. 
     Damage. Use the damage conversion table 
  below. A 2d8 Desert Eagle does 2d6+2 damage 
  in WOIN. 
     Type. Type is usually the same. Ballistic, 
  fire/heat, etc. Bludgeoning becomes blunt. 
     Range. Range increments are the same; it’s 
  shown in feet in d20 Modern, so just divide by 
  5 for 5’ squares. The Desert Eagle’s 40’ range 
  increment is a WOIN range 8. 
    Cost. d20 Modern uses a Purchase DC. Use 
  the table on the following page to convert that 
  to a price in $ or cr. 
    Size. Same (though Tiny is Small, Huge is 
  Enormous). 
    Weight. Same. 
    Availability. Assign manually. For real world 
  weapons it’ll be Genre A and AL 4-5. 
    Rate of Fire. If the weapon has a ROF of 
  “Single”, give it the single trait (which means 
  one shot max per round). If it has “A” give it 
  the auto trait. “S” or semi-automatic, gets no 
  trait; it’s the default. 
      
  d20 Modern 
  WEAPONS
  Dice
  1d
  2d
  3d
  4d
  5d
  d4
  1d6-1
  1d6+1
  2d6
  2d6+2
  3d6+2
  d6
  1d6
  2d6
  3d6
  4d6
  5d6
  d8
  1d6+1
  2d6+2
  4d6
  5d6+2
  6d6+2
  d10
  1d6+2
  3d6+2
  5d6
  6d6+4
  8d6
  d12
  2d6
  4d6
  6d6
  8d6
  10d6
  d20
  3d6+2
  6d6+4
  10d6
  13d6+2
  16d6+2
  
  Armor 
  Armor is also very easy to convert. Simply use 
  the Equipment Bonus as the SOAK; weight is 
  the same, purchase DC uses the above table 
  again. Light, medium, or heavy types are 
  already indicated. 
  Equipment 
  Equipment is equally easy. The main task is to 
  use the purchase DC, again. Most items just do 
  what they say on the tin. Where items give 
  bonuses to skill checks, add a +1d6 equipment 
  bonus for each 5 points of d20 bonus, or part 
  thereof. Where they give bonuses to saves, 
  apply the bonus on a 1:1 basis equating as 
  follows: Fort/MELEE DEF, Ref/RANGED 
  DEF, Wil/MENTAL DEF. 
  d20 Modern Purchase 
  DC
  WOIN ($ or cr)
  1
  $9 or less
  2
  10
  3
  15
  4
  20
  5
  30
  6
  40
  7
  50
  8
  70
  9
  85
  10
  120
  11
  150
  12
  200
  13
  275
  14
  350
  15
  500
  16
  650
  17
  900
  18
  1,200
  19
  1,500
  20
  2,000
  21
  2,750
  22
  3,500
  23
  5,000
  24
  6,500
  25
  9,000
  26
  12,000
  27
  15,000
  28
  20,000
  29
  27,500
  30
  35,000
  31
  50,000
  32
  65,000
  33
  90,000
  34
  120,000
  35
  150,000
  36
  200,000
  37
  275,000
  38
  350,000
  39
  500,000
  40
  650,000
  41
  900,000
  42
  1,200,000
  43
  1,500,000
  44
  2,000,000
  45
  2,750,000
  46
  3,500,000
  47
  5,000,000
  48
  6,500,000
  49
  9,000,000
  50
  12,000,000
  d20 Modern Purchase 
  DC
  WOIN ($ or cr)
  
SOURCE: textdata/thevault/WOIN/Conversion Guides/WOIN & d20 Modern Conversion Guide.pdf