I have no idea what these are, can anyone help? They are large and if i had to guess, these were part of a counter weight system that may have gone on the end of a magazine tube.

The one on the right is a Remington 1100 magazine cap with weight, probably 12 gauge.

The one on the left looks like a Remington 1100 or 870 weight probably 28 gauge or .410 bore.

Thanks Mag410, i really appreciate the input.