I'm looking to sell my bsa superten mk3 bull barrel carbine (bbk) in .177 guise its in a lovely stripped stock maybe walnut, I belive they didn't make many bbk' s in .177, only issue is the magazine sometimes fails to rotate, common problem with bsa can be solved with the new version magazines, it comes with an added silencer that matches the bull barrel, it doesn't come with a stirrup pump or dive bottle just the gun and silencer and a bsa scope, never been tuned, if it's not worth selling I will get it bowkrett tuned and buy a new magazine, what sort of price should I advertise for, I could