Short police siren, as if hitting the manual button for only a second.
If this isn't the most realistic thunder clap ever.
m240 7.62 machine gun firing 6 bursts of automatic fire, of differing lengths per burst. Small reverb, outdoor range. Mono ...
A AK47 firing. This track can loop.
I layered & edited several Freesound sounds, and this is the result. Made with Sony Sound Forge 9.
Chambering round in AK sporter rifle recorded with B1 mic through MIC200 preamp. Mastered in cool edit 96.