Thanks Azathoth! Good info.
Just a couple things: when you say you need to recut the threads, is that only if you were trying to install an M4S front on it? I would assume if you use a standard RIS / foregrip, no thread mods are req'd?
When you pull the charging handle, the port cover flies open correct?
BTW: the link you attached to Arnies for recutting threads doesn't seem to work.
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