Hello I'm new to the airsoft forum. I just have one question. I just recently bought an ARES g36 aeg with blowback. I also purchased a g&p 9.6v battery to go along with the gun. It's a 2x4 battery, excuse my lack of terminology. The battery plugs in and works fine with the gun my problem is though, when sliding the battery cover over the battery and the barrel it gives me a little trouble but i get it on. But the pin that you slide in to hold the cover/rail system to the gun doesn't line up. Should i maybe get a new battery or an external battery case/box?