I am having trouble with my airsoft we-tech m9 usmc?

Ok so i took the airsoft gbb pistol apart...its full metal and i just got it. i took it apart to adjust the hopup. i did i loosenened the hop so it had less hop...i diddnt test it out yet because I CANT FRICKEN PUT THE DAMN THING TOGETHER!!! i am so pissed right now. uugghhhh i hate this gun. anyways so i lost the spring to get the the inner barrel out of the outer barrel. i put a little ball of paper in where the spring should be. it works perfectly and i dont think thats the problem (but it might be idk). then i put it together like putting the barrel in the barrel hole and then the spring guide.i put the spri ng guide thing in the little hole dont worry i did that already. then i try putting the slide on to the frame and i slide it back and it gets stuck and then i push it foreword...i keep on working at it but it doesnt do any thing. the spring guide and/or the barrel get stuck and the slide moves down the frame. I lubed it up a lot ( A LOT AND EVERYWHERE) BUT IT DIddnt do anything. the barrel or/and the spring guide/or something else is getting stuck or somethings blocking the path. i searched everywhere for anything.i have been working on this for an hour and i am really pissed off. please answer..please i need help. if u wanna ask a question just ask it and i might get a new yahoo acount so i can answer it so please help anyone just give suggestions. note i shot it when i first got the gun and then i took it apart. i used propane and the hop up is still thare and i followed the booklet thing instructtions to take it apart so please help