I bought a red dot aimpoint t1 and a killflash. When I got it the killflash couldn't be screwed on and there was something wrong with the top turret. I called them and explained my issue in which they said return it and they will get me a new one. I explained that because the killflash couldn't be screwed on I didn't want the same one and was willing to pay the difference to get the next version up. They said no worries, too send both the killflash and red dot back and they will send me the upgraded one with a killflash installed for me. They also said they sending it out that day and just to send back when I get the chance the item I had. So that night already got my tracking number for my new one and the next day I sent back the one I had. We discussed that once I got the new one we would figure out the difference and such since they cover shipping back. Anyways I get the new one and the lowmount was not included like the previous one so I call again and he said hmm yeah and that he will order me one in and send it to me but it would take two weeks. Within two weeks I had my new lowmount and everything is good to go. On top of this they said don't worry about the difference in price. They went beyond and above what was required of them and made sure I was a happy airsofter. I dealt with Huang and he was a very friendly guy. Compared to other companies I have dealt with this is how customer service should be and I have no issue recommending them for getting parts.
A++++