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The sawed-off Shotgun reload sound is based on from a switch on sound from N.o.v.a.3?Basically when you reload it it does a sound you can heard and it sounded exactly like the switch on assault rifle from N.o.v.a.3,as for the reason maybe the orgin devs from N.o.v.a series got fired and adopted to the Wildcard sounds design.It maybe not related but it's a great tribute to the former games,such a great time...