Product Description: The Combat Application Tools, Inc. C.A.T. M-4 Tool allows the operator to clean the weapon and restore the bolt and carrier group to tactical tolerance in a matter of minutes. In the field, with gloved hands, and in low light conditions if necessary. Note: The CAT M-4 tool was designed to simplify weapons maintenance in the field, or at the range, for Soldiers and serious M4 and AR-15 shooters from all backgrounds. The C.A.T. M4 tool is 3.5 inches long and weighs only 1.4 ounces. It is investment cast from 300 series stainless steel and then the bolt cleaning chamber is CNC machined to precisely fit a mil-spec bolt. All manufacturing is done 100% in the United States of America by American workers. While the C.A.T.-M4 fits many bolts perfectly, due to very slight differences in bolts, the tool will fit some bolts better than others. All bolts so far encountered have been restored to "tactical tolerance" quickly. Inspection cleanliness can be quickly achieved by the addition of solvent and a patch or two.