Then he is a silly person. Apart from the fact they both have a bolt running on a central tube and returned by a spring they are about as different as two guns can get
As for the Stakos it's either a bad batch of bottles or the theory is correct that Luxfer and H-Pac have captured an alien queen and are milking it for horrid goo which they then surreptitiously introduce to Stako bottles and no others during filling using technology they stole from Area 51. I know which I believe, bad batch indeed