bayonet... see comments under antiques on this site...
Probably but its impractical to the point of being ludicrous unless that spot it just for storage.
That is the weakest end of the gun by far and while I have never stuck anyone with a bayonet the Gas trap Garand was changed to make it stronger to bayonet use and I suspect its a lot stronger than this thing ever was.
I would love to see it extended to see what it really is.
If they wanted a bayonet the should have made the buttstock the storage place (as was sometimes done) and made it to fit on the muzzle, this is usable even if the buttstock is broken off.
Dan