The following are the Dip Switch settings based off of MAME 0.180 source code.
 
Use this information at your own risk!  The information was parsed from the MAME source code and could contain errors as to the state, order or descriptions of what the switches do.  If you find an error, please let me know on the Contact Us form and I will work on correcting the issue. 
 
 
 
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Manufactured by Data East USA, Released in 1987
ROM Version: Heavy Barrel (US)
Print
Dip Switch:SW1
12345678FunctionOption
OffOff      Coin A1 Coin/1 Credit*
OnOff      1 Coin/2 Credits
OffOn      1 Coin/3 Credits
OnOn      2 Coins/1 Credit
  OffOff    Coin B1 Coin/1 Credit*
  OnOff    1 Coin/2 Credits
  OffOn    1 Coin/3 Credits
  OnOn    2 Coins/1 Credit
     On  Demo SoundsOff
     Off  On*
      Off Flip ScreenOff*
      On On
Dip Switch:SW2
12345678FunctionOption
        Lives1
        Bonus Life100k 200k 300k
        150k 300k 450k
        Lives3*
        Bonus Life30k 80k 160k*
        Lives5
        Bonus Life50k 120k 190k
        DifficultyEasy
        Hard
        Hardest
        LivesInfinite (Cheat)
        Allow ContinueNo
        DifficultyNormal*
        Allow ContinueYes*
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