What else do I need to complete my build of a G&P Gas Blowback Gun? Kinda what I was going for. [ame]http://www.youtube.com/watch?v=e6uh7TmlNnw[/ame] So far I have: http://gpairsoft-usa.com/shop/en/30...-metal-body-black-wp139b-for-airsoft-gun.html http://gpairsoft-usa.com/shop/en/30353-gp-airsoft-defender-front-set-gp852.html Stock and grip (I will get them myself). and is there like a manual to build all of this? and will a magpul ubr stock fit easily on a gbb gun?