ArtStation - DeWalt Guns, Tom McDowell
DIY nerf gun
Compact Weapon Design , Edon Guraziu on ArtStation at https://artstation.com/artwork/compact-weapon-design-0fa0229d-7afa-4212-83ed-482b830b82ef
Mass Effect-themed Nerf Stampede by Brian Johnson (Johnson Arms)
Sniper Rifles: More
Econo can. $75 adapter that turns an oil filter into a suppressor. (tax stamp required)
Using a tactical scope
A great diagram of how you use the military front sight to range.
Basic knots you should know.