It is only semi auto. I think any M4/M16 variant (real or airsoft moddeled after one) that chambers a .308 only shoots semi auto.
But as far as accuracy goes, this guy where I go has one. He really likes it but out of the box it shot just like any other CA M15 on semi. The accuracy was very similar. He swapped out barrels and springs and now it's amazing.
OK guys... The CA25, long, short, urx, match or anything, shoots semi-auto as well as full auto. They shoot about 350 fps out of the box, probably somewhat less. The A&K is a copy of it, somewhat better made as far as internals goes (...all ball bearing stuff in it) but at the same time somewhat crappier in looks and finish dept. The CA is better made in this dept. However CA's got some issues wwith the markings (USMC markings?) and it is a copy of the G&P SR25.
All these AEG's should be fully compatible.