Earlier this year ATI began selling the T-14, an AR-15 style .410 shotgun that uses a standard AR-15 lower. I have been asked many times if and when just the upper on its own will be available for sale. I learnt from Suburban that AIM Surplus are now selling just the upper for $499.95.
The upper had a 20″ smoothbore barrel and is supplied with a five round magazine. Two models are available, the Classic and the Compact. The only difference between the models is the handguard length.