M4 Drum Mag 1100rds Auto Winding

The Classic army M4 1100rds make it easier for you.
the automatic winding system makes it easy to keep shooting without winding yourself.
batteries not included.

NOTE THAT WITH EVERY MAGAZINE IT CAN HAPPEN THAT THE BB'S DO NOT FEED PROPERLY ON A CERTAIN BRAND OF REPLICA.
THE ADVICE IS TO TRY A DIFFERENT BRAND OF MAGAZINE, IN ORDER TO SOLVE THE PROBLEM.