Well, I am very pleased with the customer support at Zero One, I had to change a Box of 10 M16 Mid Cap Ares Mags, quite a while after I had bought them, probably about 2 Weeks, and I rang them up and asked if I could change them for 2 ICS High Caps and one Battery, they said yes so I posted the Ares mags back, they got them the next day and then put my order in the post first class and I got them today, Not really a full review of Zero One but just a tidbit saying I am happy with the Customer Service, they were very helpful