I would say you have an AR. It should be DA/SA, all stainless, have poly grips and a non adjustable trigger. I have one and wouldn't part with it. I improved mine by sending it to Grayguns for their X5 Lightning package which I was very happy with. I don't think you will see "X-Five" on any of the X-Five guns.
The Competition and L1 models are SAO and do have an adjustable trigger. Then you have the Tactical which has an alloy frame. If you want, you can fit a mag well and the NILL wood grips which I have also done.