Hi, yes I agree, I love this stock. It's actually a BSA Techstar. It was designed by John Bowkett for the US market. The importer Compasseco (now Pyramid Air) wanted an entry level high power pcp with open sights.
It was also named the Tech Star, Stinger, Westerner. Apparently the Americans didn't like the simple stock. But those who bought one, usually find it their best airgun. I love it.
The stock is based on the Lightning/Spitfire stock. They aren't for sale anywhere. But I am thinking of replicating a few.
Cheers, Louis