Bunny Workshop are stockists of Sightmark optics and one of the items that they have in stock right now is the Wolverine 1x23 CSR Red Dot Sight in Dark Earth... "Designed specifically for shotguns and short-barreled rifles, the Sightmark Wolverine CSR FDE features a 4 MOA red dot reticle with a 23mm objective lens and adjustable digital switch brightness controls.