I also hope you do not have the spring as in this image:
http://i346.photobucket.com/albums/p...a/DSC01002.jpg
they should be around the other way... laying 'flatter'
If you check in with 'everythingairsoft.com' you should find a link or two in the 'reviews/guides' for the 5.1
I have a guide linked from there.... somewhere... O_o