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I have a Madbull JP frontend installed on my ICS m4.
I had to buy a Madbull re-threading tool and have my gun doc re-thread the body to make the frontend fit properly.
There was also a bit of wobble after it was installed, that was fixed by adding a rubber washer from a stock TM piston head to make it more of a snug fit.
Works great and looks slick as hell now!
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