unit – Activate a specific element in a table?

In my table there are 6 elements "pistols" and I want to activate an element after having deactivated them all. Here is my script

public saveInfo _file; // retrieve the gun identification number from the backup file.
public GameObject Player1_pistol;
GameObject public[] pl1_p; // 6 pistols

empty Start ()
pl1_p = new GameObject[Player1_pistol.transform.childCount];
for (int p = 0; p <Player1_pistol.transform.childCount; p ++)
pl1_p[p] = Player1_pistol.transform.GetChild (p) .gameObject;
pl1_p[p].SetActive (false);
// Now I have to activate the third element of my table.