FCW M870 1200rds Electric Magazine Drum For Marui System Gas / Air Cocking Shotguns 
 
Electric Power Swing BB Upload Drum
Fit To Marui Air Cocking / Gas M870 Shotguns
Fit To Golden Eagle Gas Gas M870 Shotguns
Fit To CYMA & ALL Marui System Air Cocking Shotguns
<<ALERT>>
As the BB uploading of this magazine drum may not as fast as your pump action, also difference BB uploading efficiency rate  for difference brand of M870 will be coming out !