Gun cleaning kits are available in 5 different sizes and models. Gas Sensor. Size1：Gk28-C（28-piece set）. Size2：Gk37（16-piece set）. Size3：Gk44（21-piece set）. Size4：GK47（16-piece set）. Size5：GK38（15-piece set）.

Gun cleaning kits are available in 5 different sizes and models. Size1：Gk28-C（28-piece set）. Size2：Gk37（16-piece set）. Size3：Gk44（21-piece set）. Size4：GK47（16-piece set）. Size5：GK38（15-piece set）. The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies.