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I had a G&P MBK on my TM M4. Thread on the upper receiver were a little large. Sanded off the paint, fitted the steel barrel nut with a barrel wrench and it basically rethreaded itself. Worked. Alumnium body with a steel nut would work as alumnium is softer and galvanisation would occur down the road that would bind the steel nut to the alumnium receiver. Rock solid front end.
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