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This is a drop in replacement for the Classic Army Stoner 96 LMG's foregrip. You will need to remove the front bracket of the stock foregrip (it will come off with the stock foregrip) and fix the gastube to the rear foregrip bracket - I'd recommend either shimming it tight with aluminium tape or epoxy.
You should not need to remove the front sight or replace the gas block.
This foregrip replacement will allow the use of M-Lok attachements, greatly extend the amount of usable rail space, reduce the system's weight and improve it's balance.