I remember as a kid I has an airsporter and my mate had a MK 3 the Bsa was more powerful and much more reliable ( and we used to give them some stick )
his used to keep undoing every screw and pin and he needed a tool kit in his pocket to keep it working
The airsporter just kept going ! Having said that I loved his MK3 and thought it was the most beautiful thing on earth ( not really too involved with girls at that age )
Have one of each and a osprey Now ( another gun that was WOW first time I saw it ) Never really shoot them but they are nice to have