Last week, I made a cardboard FN-P90. I will show you how to make this and with these steps you can make any other gun you want too.
First, find a bunch flat cardboard, a pencil, box knife, exacto blade, glue gun, ruler, shears, and a printer if needed.
You can print out the picture in Adobe Acrobat to get it to full size so you can use that as a template, but I just print a small picture and free hand the shape onto cardboard. If you want to make a more complicated gun, plan out the pieces you’re going to make on the gun picture you printed.
When you are done tracing onto the cardboard, use the shears to cut the straight and slightly curved lines. For the lines where you can’t use shears, use the exacto to score the cardboard then cut it all the way through with the box cutter or just keep using the exacto. Repeat this process so the you have at least 2 cardboard gun cutouts.
Once you have all the layers you want glue the pieces together. Without two or more pieces the cardboard will bend. Then paint the gun the color you want.
Here is a picture of my finished P90:
Here are two other guns I made with the same method.
The Costume Kid 