WE GBBR M4/16 Part #67 Spring
 

Hi, I've lost my Part #67 spring and I was hoping someone knew where I could get a replacement spring.

It is the spring that pushes up on the infamous Part #66
http://www.ipscgm.com/images/RIMG1241_exposure.gif

http://img12.imageshack.us/img12/8903/img0365x.jpg