Master Key Sons of Guns : Season 1 Episode 2
TV-14 (self-applied) Discovery 1h 00m int(0)
Aired: January 26th, 2011 @ 12:00 AM EST on Discovery
Will and his firearms team have to combine two different weapons — an M16 machine gun and a shotgun — to build a Master Key "door breaching" gun for a SWAT team. For inspiration — and extra fun — Will and daughter Stephanie buy and fire a Grenade Launcher.