For the last five years, Iran has been producing Shahab 3 IRBMs. This missile is basically 1960s technology, with the addition of GPS guidance. Russian and North Korean missile technology has been obtained to make the Shahab 3 work. This has resulted in a missile that apparently will function properly about 80 percent of the time, and deliver a warhead of about one ton, to a range of some 1,700 kilometers, to within a hundred meters of where it was aimed. By world standards, this is a pretty effective weapon. A solid fuel version of this missile would be, if the solid fuel was of reasonable quality, about ten percent more reliable than liquid fuel, and easier to hide and launch.