Mossberg 500 forend tube diameter

Jäger1

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oops, wrong forum..maybe you guys will know anyway

I'm looking to modify a magpul 870 forend to fit a mossberg 500/535 forend tube. I understand I have to open up the internal tube area a bit. Can anyone give me the diameter of the mossberg forend tube so I know what size tools to borrow from work?
 
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