American Tactical Alpha Maxx 410 Gauge 10" Pistol Upper Receiver Kit - ATI 15AX410KIT10

This is a complete upper receiver kit for AR-15 platform pistols chambered in .410 gauge with a 10" rifled barrel (1:20 twist). It includes a 5-round magazine, adjustable gas system, polymer M-LOK rail, quick-detach front sight, 3 oz buffer, and cylinder-style choke, and requires any mil-spec AR-15 lower receiver to function.