one is a "sniper scope" it is very easy. i am still working on it. i think you can figure out what it is made of just by looking at the photo... if not, it is two toilet paper rolls on one tube i got from a roll of wrapping paper.
other is smaller and for smaller nerf guns such as the maverick... it is only a part of the tube mentioned above.
i covered them in mod podge( paper mod podge) and spray painted one.
ignore some of the extra imagenotes.