Eagle Industries MP5 Shoulder Rig

This system is designed for carrying a submachine gun under one arm and spare magazines under the other.
To operate, just hit the thumb break and pivot the weapon into firing position while it is still attached to the harness.
Or, if the situation permits, the weapon can be totally disconnected using the quick release.
SMG comes with harness and mag pouch shown below. Mag pouches also sold separately (Part # SMG-MP).
 

                                Price Western Leather Covert Shoulder Rig