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barrel is fine and mags are fine. threads are different pitch as my marui flashider won't fit on my ics. i don't advise people to do 400+ fps upgrades on ics m4 as the split mechbox has limits. you can do bushings and such (ics ones) and they make complete upper mech box kits with an m120 for easy changeout. but for guys who want to buy a gun and are planning a shitload of upgrades before they even get it, this is NOT the gun for you. get a tm. the mp5 series is a little different. same proprietary parts (mostly) but more upgrade options. handguard is different than marui but i haven't tried to interchange them (what for i don't know). thread is left hand on flashider btw.
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