I've used WE and other brands of delta ring on 3 different ICS M4's (G&P RIS, King Arms RAS2, stock ICS foregrip [just sick of the POS delta ring in the last case]), they are a PITA to get on, thread spacing and pitch is the same but the height of the threads on the receiver meant that I had to tighten/loosen over and over till I could get it all the way on. you can swap out the delta cap for a proper sized one (afaik has now moved to a standard size delta cap)
you will have to file down the tabs on the outer barrel about 1/8th.
Last edited by LongStone; June 26th, 2013 at 19:47..
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