Resetting Properties Of an Object Using LINQ

Suppose I have a method called ShowScores and all this method does is display each gamer's score. Basically there is a GamersRecords class which contains a  list of records. Each record has GamersName and Score properties. I want to set to zero all the Scores that are below the Qualifying score of 50 using LINQ. 

Below is what I've tried but I was not successful.

public class GamersRecords
{
   public GamersRecords(List<Record> records)
   {
     this.Records = records;
   } 
   public List<Record> Records{get;set;}  
}

public class SomeClass
{
   public ShowScores(GamersRecords records)
   {
     var newRecords = records.selectMany(g=>g.Score < 50).Score=0;

     foreach(newRecord in newRecords)
     {
       Console.WriteLine("Contestant's Name " + newRecord.GamersName + "Final Score" + newRecord.Score);
     }
   }
}