Chassis Systems as an Australian online retailer of some rather interesting firearms gear. From what I heard it has some very happy customers.
I can't say I'm one of them. I not aiming to bash any business unnecessarily, but a cautionary tale might help you weight up your options.
I placed an order for a cheap scope mount, paid with card and received a nice automatic email informing me that a shipping notice should come through after the items ship. Two weeks passed and no notice came. I did some research, found that this had happened before to others, so i contacted Chassis Systems and asked them for the status of the order. I also tried through Facebook and got a quick reply from someone who i assume was the owner. He assured the that the notice would come through in a week. Sweet. So I waited a week. No notice, and their FB page disappeared. I found this had happened after a customer had complained on that page about not receiving their order, red flag moment. So i got back in touch and asked again via email if the shipping notice was coming and if everything was ok. No reply. I sent another email giving 7 days for a refund, a shipping notice or an explanation. No reply. Filed it with the bank. Got money back.
Its a damn shame I won't be using them again as they had a few other items I liked the look of.
I won't tell you what to do or not to do, but sometimes a story will suffice.