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ICS uses Imperial threads on the barrel nut. So you'll need to find one that's compatible with G&P, WE and Systema. Most airsoft barrel nut are Metric. If you have a loose tolerance or worn threading on a ICS, you might just get away with a Metric nut. Try removing as much paint/finish as possible and thread on the barrel nut. Add some cutting oil and screw on and off until you can get it on all the way. This could take awhile to do.
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