Barrel bands

[where's it gone]

If it is the barrel sling attachment (uncle mikes ?) one of the screws is hollow for the sling pin, I'd be very surprised if you can buy one of those at a price that's worth the effort.

You're quite right. One grub screw required.

[robs5230]

You're quite right. One grub screw required.

If it is the uncle Mikes barrel band, the grub screws are generally made of cheese so I replace them with an allen headed bolt from the top of a scope mount.
The hollow one you have little chance of replacing. That is there to tension the band for varying diameter barrels and to let the swivel pin pass through