AirsoftElite

Hi all Had an Tokyo marui AK47 since about 2003, used it a lot back then but ever since it's been kept in storage. Last time I did use it maybe around 2008, it was chronod and I could see it had lost some power, I imagine its lost even more now. I want to bring it back to life, is there anything I should consider due to its age? And is there a relevant upgrade kit for that age+ model AK47? Many thanks