Things You'll Need
Instructions
Purchase a pair of inexpensive binoculars. Binoculars with uniformly straight cylinders adapt most easily to the surface of your airsoft gun.
Take apart your binoculars using a Phillips-head screwdriver. If necessary, saw through the connecting pieces using a hacksaw. By separating both magnification cylinders you avoid needing to hang the second cylinder off the side of your gun and can create a second scope of a second weapon.
Smooth down any rough or sharp edges using coarse-grain sandpaper. Once the major protrusions are removed, finish smoothing down the metal or plastic with fine-grain sandpaper.
Position the makeshift scope on top of your airsoft gun. Ensure that the scope does not interfere with any other moving parts, such as the cocking mechanism or feeder tube, and that you have easy access to the eyepiece when firing your airsoft gun.
Attach the scope to your rifle with two strips of duct tape---one toward the front end and one toward the back end. If possible, wrap the strips completely around the gun for the most secure hold. However, this may not be possible due to the scope's placement on the gun.