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In case this helps I got the ICS (ae) version 3".5" from Canadian airsoft..nice piece of work...I hadn't been warned that it had been upgraded but once I read up a bit I was happy to know what they'd done. Great gun, all you have to do is remove the orange tip with a scouring pad and some mat black paint (the orange tip due to coming from the US)
And to answer your initial question as per my reserch the version 2 has 4 holes in the rear sight the version 3 has the 3 and one v-notch for poor light and tactical purposes.
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