FCW M870 Tran M4 Adapter with Metal High Capacity Magazine BK
 
M4 Adapter Fit CYMA / TM 3rds Burst Air Cocking Shotguns (Not Included TM SPAS12)
M4 Adapter Fit TM / Golden Eagle (JAG) / 3rds Burst Gas Shotguns 
May Fit To A&K Air Cocking Shotguns, but Modification May Be Needed
Coming with Army M4 AEG Metal 600rds High Capacity Magazine