1, A good tongue is a good weapon. 

2, Weapon bode [breed] peace.

3, The police still haven't found the murder weapon.

4, Discipline was the new coach's secret weapon.

5, The policeman ordered the criminal to drop his weapon.

6, Their most potent weapon was the Exocet missile.

7, He was charged with assault with a deadly weapon.

8, A hand-grenade is a missile weapon.

9, The guard fan ned him for weapon.

10, He was charged with carrying an offensive weapon.

11, What was the murder weapon?

12, The human race has one really effective weapon, and that is laughter. Mark Twain 

13, The police are still looking for the murder weapon .

14, After a long search for the murder weapon, the police found a knife.

15, Education is the most powerful weapon which you can use to change the world. Nelson Mandela 

16, The new weapon was too inhumane to be used.

17, Jan was convicted of possessing an offensive weapon .

18, He had never handled a weapon before.

19, The weapon used in the raid was a replica.

20, He was carrying a concealed weapon.

21, She was holding an extremely odd-looking weapon.

22, A hammer can be a lethal weapon.

23, The police nicked me for carrying an offensive weapon.

24, The weapon discharged when it hit the ground.

25, The workers' ultimate weapon was the strike.

26, Police frogmen searched the lake for the murder weapon.

27, He was then arrested and charged with possessing an offensive weapon.

28, He was acquitted on charges of assault with a deadly weapon.

29, Dream of action is the starting line, knowledge is our forward accelerator, adhere to is that we do not stop the pace,(http://sentencedict.com/weapon.html) the wisdom of our success is a magic weapon.

30, Enriched uranium is a key component of a nuclear weapon.