Each interior angle of an octagon is 135o.
The sum of the exterior angles of a polygon is 360o.
A regular octagon has equal angles, thus:
8 x exterior_angle = 360o
⇒ exterior_angle = 360o ÷ 8 = 45o
The interior and exterior angles of a polygon are supplementary, that is sum to 180o.
interior_angle + 45o = 180o
⇒ interior_angle = 180o - 45o = 135o.
an octgon
there are eight
An octagon has 8 sides
124
Could be a lot of things, is this a pump, rolling block (single shot), need more details, barrel length, take down, etc.... Also it's often referred to as Octagon but it's not it's Hexagon, off hand I can think of no manufacturer that ever made a Octagon barrel.
If im correct the elimination chamber is the one the is a octgon shape with 8 people vs at one Tim. So to make the elimination chamber you would need metal if your are making model of it for school or something you would use cardboard something lite because you don't what to carry something that is heavy so to make one you need: Cardboard Sissor Gule paper paint (if you want to paint it that is) wires(for the out side) That's pretty much it that's how i made one