Just got done building my first bullet trap for my backyard shooting range. The design is extremely simplistic and was a breeze to do. I bought a piece of 1/2" steel from a local shop and had it cut to 12"x18". I then cut out two triangle-snapped pieces of wood for the sides. Two sides are at a right angle while the back side is cut at a 45 angle. The steel sits 12" wide and the 18" side goes up the 45 cut on the triangles. This allows me to use regular printer paper to print target on and I can staple them into the front edges of the triangle, since paper is 11". I drilled holes in the plate and used lag screws to secure the plate to the triangle support pieces. The bullet enters the opening and hits the plate that is angled at a 45 which deflects the bullet downward into the dirt. I tried it out this weekend with a 22 and it works like a champ. I may make a pile of sand to sit the trap on top of when shooting larger calibers so that any leftover energy gets absorbed better by the sand. Total cost $35. Total build time not including paint, 30 minutes.