SKYWALKER, BULLET - BULLETS STRIKING METAL

These're Skywalker Sound SFX.

Movies

 * Saving Private Ryan (1998)
 * Terminator 2: Judgment Day (1991)
 * Young Indiana Jones and the Attack of the Hawkmen (1995)

TV Series

 * The Young Indiana Jones Chronicles

Video Games

 * Secret Weapons Over Normandy (2004)
 * Star Wars: Battlefront (2004)

Audio Samples
Elements of the sound can be found in the aforementioned LucasArts video games. It perhaps debuted in T2 and can also be heard with the 2nd gunshot that begins the fire/explosions near the end of Attack of the Hawkmen.