Sig Sauer Model 556 Customs and Border Protection / Air and Marine. This is a collector grade semi auto rifle chambered for 5.56 x 45 Nato rounds. This rifle was sold only to active duty CBP agents by through CBP. My research through Sig shows a manufacture date of April 2013 then shipped to CBP / Air and Marine base at Port Isabel Texas in the same year. The bolt and upper housing still have the original grease. I have never seen, nor do I know of any Sig CBP 556 rifle ever offered for sale. Anywhere. If you are a collector, this Sig would be a top addition to your SIg collection, right up with the Sig AG's! Look close because if you don't buy it, it's not likely you will ever see one for sale again for a long while. I have bought and sold these rifles for years. They continue to rise in value, and the rarer they are, the more they increase. This is RARE!! Face to face transactions, located in Tampa. Thanks for looking. Contact cell is 812-277-6407