Quote:
Originally Posted by kaiu
In this guy's case, it was metric...
http://www.airsoftcanada.com/showpos...0&postcount=25
When I purchased my Madbull MK18 rail from Jugglez he told me ICS used metric so I bought one, and it fit perfectly on a brand new ICS of course.
Old picture, the rails meshes perfectly too which is awesome:
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Like I mentioned. You might get a low tolerance threading which both threads will work. ICS isn't known for high quality, tight tolerance machining. Also, if you have a plastic upper, that will give a little and can accept Metric threads.