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Connor, You can not replace forend grip on his model without replacing the action slide and tube (action assembly). The forend is molded to the action slide so you have to put in a new action slide and action slide tube. Lot of you tube vids on replacing forend in these firearms. As far as forends when you replace action slide/tube lot of them out there. Mossberg, Mako, ATI, Hogue. The action assembly tube on this firearm is 7 5/8 you have to put a adapter 6 3/4 hogue adapter nut. to make it just like a 500 action assembly to fit any tactical handguard forend. Takes pretty detailed disassembly of firearm.
Connor, yes, you will have to replace the whole "Action Slide" since the Forend is molded to it. It is not difficult and here is a how to video : https://www.youtube.com/watch?v=kaGXnr-i3-w