This Chester County Armory listing is for a low serial numbered (518) Rock Island Armory XM15 A1 5.56mm rifle. This fully transferable machine gun not only features a low, three digit serial number, but has also been acquired from Colt, who originally brought it in for their own testing and evaluation. It is in excellent shape, down to the original barrel wick that comes with it. This machine gun is fully transferable. For more information on this listing or to view our other NFA and investment grade firearms, please visit our website at www.chestercountyarmory.com, or contact us via the information listed below. Chester County Armory West Chester, PA email: [email protected] phone: 610-235-6155 www.chestercountyarmory.com