What is this circular dial thingy underneath my receiver?

[KommanderKarl]

Bought a SA Garand, judging by sn, manufactured sometime Feb of 1943. Saw this strange doohickey attached to the stock and I haven’t a single idea what it is. Figured I’d ask here!

[KommanderKarl]

Sorry, bit of research yielded that it is an attachment piece for a grenade launcher kit, specifically the sight.

[David Milisock]

Grenade sight mount.

[LavaTech]

Even stranger still is the location of that mount.

[Orlando]

be careful the edges are usually kinda sharp, best to take it off

[Rogue5]

Was there a specific spot for these grenade sights mounts were to be placed? like Were these screwed anywhere close to the Receiver just on the Right side of the rifle?

[Orlando]

They are normally located further forward under the clip latch

[SA1941]

Looks like you need to find a grenade launcher now!

[jak]

This is where the sight should be located.