YOU SAID:

If you use a gun in 5

INTO JAPANESE

あなたが5で銃を使用する場合

BACK INTO ENGLISH

If you use a gun at 5

INTO JAPANESE

5時に銃を使うと

BACK INTO ENGLISH

With a gun at 5 o'clock

INTO JAPANESE

5時に銃で

BACK INTO ENGLISH

With a gun at 5 o'clock