I'm not sure what your criteria is but here is a AR15 .410 upper. It is fed from a detachable magazine. ATI AR-15 A3 T-14 Upper Assembly 410 Bore 20" Barrel Chrome Moly Matte with Flash Hider Pre-Ban - MidwayUSA
The T-14 upper receiver assembly from American Tactical Imports (ATI) introduces the versatility of the shotgun to the AR-15 platform. The 410 Bore upper receiver fires the complete range of 2-1/2" 410 Bore shotshells from birdshot, to buckshot, to slugs; offering multiple possible uses from a single platform. The upper assembly comes complete with a 20" smooth bore barrel, polymer A2 front sight assembly, enlarged A2-style flash hider and 5-round polymer magazine. Drops onto any Mil-Spec AR-15 lower receiver without modifications, and is ready to go right out of the box. Manufactured by Safir Arms of Turkey. NOTE:
This upper assembly is the "Compact" T-14 variation, which is the same size dimensionally as the "Standard" T-14 upper, but lighter in weight by about 1 pound.