What is it ?

[RCS]

What is it ?Attachment 106682

Information

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[RCS]

here is a clue for the part posted Attachment 106689

[browningautorifle]

Mounting rail for the M203 grenade launcher...and top handguard...

[RCS]

not a mounting rail but related to the M203

[browningautorifle]

Well, it slides on it...here... Never really knew the name for it.

[RCS]

You are correct, it is the barrel extension part # 8448315, when you slide the barrel forward it cocks the trigger