My HW44 came with the mod unscrewed in a 17" Flambeau pistol case. Way back in the day I had a Falcon FN8WG that was a similar sort of length and I used the case from a B&Q laser-level kit. I know that case fits the HW44 with mod as I had mine in it until I fitted a rifle stock. I've never seen anything similar intended for gun use and, of course, that laser-level kit is long discontinued.