i have a box cannon mauser i took apart to fix one prb then i made another.Idont know where one of the springs go if anyone knows please help me

well ill go ahead and tell you need to be more detailed when describing the problem how long is the spring what was the previous problem, anything you can tell that might help.

Don't know if this is your brand but maybe it'll help.
http://www.boards.ie/vbulletin/showthread.php?t=2055328776

As for the springs, if you can find the dimensions from other owners you could buy replacements here if there is a lack of support by airsoft retailers. http://www.mcmaster.com/#