M16 LOWER HANDGUARD NSN NUMBER HELP?

[HOOKED ON HISTORY]

Ras Rail
I know this is an old Thread but saw your WTB ad today for same. I was lucky enough to get a set years ago for one of my rifles. As I understand there are always left over lower halves as they are not fitted when a grenade launcher is installed. So plenty spare lower halves around, never any top halves.

Do hope you can find one.

Thanks for solving that mystery! I figured there was a logical explanation. Round two. Why are there lots of M-16 A1 NOS left hand guards and no Rights? I have found several lefts. No rights.