*"Colt XM177 5.56mm Submachine Gun" – Warboats.org*U.S. SUBMACHINE GUN XM177 – Springfield Armory Collection*Retro Black Rifle.com – Guide to AR10/AR15/M16 Rifles up to the mid-1980s
ISBN 0-451-21447-1==External links==*"Colt XM177 5.56mm Submachine Gun" – Warboats.org*U.S. SUBMACHINE GUN XM177 – Springfield Armory Collection*Retro Black Rifle.com – Guide to AR10/AR15/M16 Rifles up to the mid-1980s