|By law, the Civilian Marksmanship Program can sell surplus military firearms, ammunition, parts and other items only to members of CMP affiliated clubs (like New York City Guns) who are also U.S. citizens, over 18 years of age and who are legally eligible to purchase a firearm. You must provide a copy of your current membership card or other proof of membership. This requirement cannot be waived. The CMP currently has over 2,000 affiliated organizations located in many parts of the country. New York City Guns is one of them.