I think the aim brace is a weird addition for the Tempest. As a teenager in the 80’s we all wanted Tempests, they were seen in our eyes as the best air pistol you could buy but one of the main reasons was the size, it was easy to tuck into your waistband and wander over the fields with it. We knew the Scorpion was more powerful which is an extremely important factor to a youngster but being roughly the same size as a bus we didn’t really go for them. I suspect we were not alone in our thoughts of being easily carried and I’m sure Webley sold many for that reason. We would never have wanted an aim brace because it would have made the Tempest too large,if you wanted something a touch more accurate and size wasn’t an issue you went for the Hurricane instead (which none of us did) I think it’s that the makes the aim brace a bit niche, I’d own one from a collecting point of view but I wouldn’t fit and use it I don’t think.