This adapter rail is the perfection solution for extended the small picatinny bottom rail on the FX Impact. With a simple picatinny-to-picatinny mounting system this product will extend the rail out another 8 inches under the air tank. This product is manufactured by another Utah company, Modular Evolution. You will not be disappointed in the quality or craftsmanship. Be sure to take a look at the Modular Evolution Bipod as well!