Sons of Guns (2011)

S01E16 Folding Flashlight Gun

Inspired by Charlie’s impressive folding pellet gun, Will encourages the Red Jacket team to design a unique flashlight that transforms into a semi-automatic M11 rifle when unfolded. Meanwhile, the new recruit, Flem, faces a challenge as Will assigns him the task of constructing an MG42 machine gun, also known as "Hitler's Buzzsaw," entirely from the ground up.