2 sentences

1. 我以前从未打过枪。

   wǒ yǐ​qián cóng​wèi dǎ guo qiāng.

   I've never shot a gun before.

   Source: OpenSubtitles

2. 我只打过一次枪。

   wǒ zhǐ dǎ guo yī​cì qiāng.

   I have fired a gun only once.

   Source: CCMatrix