Simple Set up and really served me more than 2 season.
Primary : ICS M4A1
Backup : KSC Glock 19 with 5 mags.
Secondary : Another ICS M4A1 or Second Upper mechbox or Third one.
Actually, I used to have Real Sword Type 56 backup in winter but it's not really worst since I barely play them thought and also a PTW backup as well. None of them worst compare to my ICS M4A1 for price wise so get ripped of them and gone good for holiday.