This is a NCSTAR Bag known as the Rifle Scabbard, model CVRSCB2919B.
The Tactical Rifle Scabbard is designed for an easy" comfortable" and secure way of carrying a Rifle/Carbine over the shoulder or for modular mounting onto MOLLE compatible gear.
Features:
MOLLE Webbing on Both Sides
Removable Pistol Grip Retention Strap
Padded Shoulder Sling