I bumped an old thread in the smithing section and no one has replied. I can't find a PDF instruction on it either. From what I have read you drive a pin out and that should release the front sling attachments. Then use some type of oil to release and rubber thingy that holds the sling attachments. Insert the IMUNS , sling attachments , disregard the rubber thingy and reinsert the cross pin. Is that how it works? I read the instructions that come with the IMUNS are vague at best and I couldn't find any info on the net so that is why I am asking. I should have the unit in hand on Tuesday but I would like to know how to install it before hand. My chassis does not have the spigot to remove. Any help is appreciated!