Ati 410 magazine 5rd is designed only for use with 2 1/2" shotgun shells.*note- the omni hybrid 410 shoutgun only works with 2 1/2" shotgun shells.Please check the length of your shells prior to attempting to fire them.Other cartridges such as 45lc or 45-70 will not operate with this firearm.Magazine will not function with safir brand t-14 upper previously imported by american tactical.Caliber: 410 GaCapacity: 5rdFinish: BlackModel: OEMMaterial: PolymerType: DetachableModel Fit: Omini Hybrid MaxxBrand Fit: American Tactical ImportsCapacity: 5