Clamp on sight

[Powersgt]

I’m helping a friend go through another of his friends estate and we came across an unusual sight system. This gentleman was a avid Colt AR shooter so I thought it might belong to such. Anyone ever seen something like this?

268149

[edp2k]

Looks like some kind of grenade launcher sight for a rifle that goes over the barrel.
The section with the vent holes goes towards the muzzle end.
I have never seen such for an M16/M4/AR15 type rifle,
must be some other kind of rifle.

I'm thinking WW2/Korea/Vietnam/African-bush-wars eras.

[abunaitoo]

I'm almost sure it a night sight for a MAS 49/56.
I have one and it looks kind of like it.

[edp2k]

Yes, as abunaitoo said, it's a grenade launcher sight for a french MAS.

\https://www.reddit.com/r/whatisthisthing/comments/8ojs4z/mysterious_grenade_launcher_sight/

https://imgur.com/a/ZH3AGod

[Powersgt]

Thanks for the help; there was a bayonet in the stuff to for a French MAS.

Powersgt