Well, you really don't want something infront of a PEQ2/PAQ4 since that would most likely not give the PEQ2/PAQ4 a clear line of sight for the IR laser/light it shoots out an it would be pretty useless than.
Also, you would be mounting them on the handguards, there is a "heat shield" but its attached to the inside of the handguard an you wouldn't mount anything on that.
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