Sons of Guns (2011)

S02E05 Grenade Launcher Silencer

Title: Silencing the Boom Plot: The Red Jacket team faces a daunting challenge: transforming a fully automatic Mk 19 Grenade Launcher into a silenced, single-shot weapon. Simultaneously, Kris experiments with making a hunting rifle buoyant for a client, while Will works on creating a unique knife that can fire projectiles.