I did this in december,
1) take a pair ofof blue jeans, or old BDU's, and cut the legs off.
2) Then take the legs, and cut them so that you will end up with two rectangles
3) measure out the material you'll need to go around the barrel of your gun.
4)Take the material, and sew, or hot glue, it so that it makes a cylender that will fit over the barrel
5)Aplly your material to the cylender of jeans or BDU's
6)Take the other pantleg, and drape it over the gun
7)cut out a hole if you have a scope on the gun, or if you need to be able to use something on top of the gun (like cuting out holes if you have bead sites, like on BB guns)
8)Aply velcro to the gun and pantleg, so that the pants will stay in place while moving
9)Aply your camoflauge to the pants
Viola, you have a gun wrap that will look like your ghilie suit