For sake of argument, you may wish to buy a little rail from Magpul or Midwest Industries and attach it to your standard M4 handguard. That way, you only have an isty bitsy rail to deal with and you can mount almost any forward grip you want. There are plenty of rails specifically made for the standard M4 handguard. DSG Arms has a pretty good selection. http://dsgarms.com/Category/25_1/Handguards.aspx
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