No worries Johny 1, you got a pretty good bike for the money.
The swinging arms are OK - they make for quicker turns on a technical track and put less force on the suspension pivot bearings.
The only thing you may find with your bike is that you have a pushrod engine instead of the OHC model as advertised.
None the less these bikes are probably one of the better Chinas you can get.
If I were you, I would get either a 48 tooth sprocket for the back wheel - or go a 16 tooth front with 56 tooth rear sprocket. This will give you a lot more accelaration - although top speed will be cut a little. I think the 41 tooth sprocket the bike comes with is just so that they can claim a higher top speed - but is not really practical for dirt work.
If you tighten up the back wheel to the recommended torque and find that the sprocket fasteners are binding on the swinging arm as the wheel goes round, use a 16mm stainless washer as a shim between the suspension swinging arm and the rear sprocket side wheel spacer.
Hope you enjoy the bike.