Can I use these for this airsoft gun?

Hey all, I've been thinking about buying the Boyi DBoys AK74 Airsoft AEG RK03 from AirSplat.com and I was wondering if there is a tightbore barrel that will fit this, if there is, please post the a barrel or barrels that can fit this gun. Also I was wondering if the Sanyo 9.6V 1500 mAH Ni-Cad Stick Battery would fit the gun, thanks in advance :).