dangerous BSA Supersport

[craig9mm]

a friend was given the above.On the outside the stock,aircylinder look vgc,altho barrel a bit tatty
I said I would put a scope on it,and zero it in for him . I tried cocking the gun but it would not cock. I assume the sear not engaging.
A third attempt it cocked but went off when the barrel was closed. No pellet in as I had a feeling this was going to happen
Definetly felt odd,at the end of the cocking stroke .Cant think of a word to desribe it. Very Gritty?
Its a Brum model. I suspect someone has been messing about trying to lighten the trigger pressure
As best as I can see the grubscrew in the trigger blade is there but I havent found an allen key to fit. I have a lot of keys and did lighten a S/S trigger several years ago
I wonder if the grub screw is damaged, amongst anything else
I havent stripped the gun down yet . Cant says I want to but Ive known the new owner years and he isnt in the best state to do it himself
I asked him re prev owner,an elderly chap unlikely to mess with it but someone clearly has bodged this v badly
I much rather shoot than dabble..
Any suggestions?
atb
craig

[evert]

Take it all apart, clean it, look for wear or modfications to the sear surfaces.
It they look ok, reassemble, but add some sears spring tension, then try it again, and try to deliberately provoke the discharge.

[WebleyWombler]

Find an Allen key that fits first and try to adjust the trigger. if that works, Chrono it and see whether it actually needs a strip

[ZAKDINGEL]

As above try the trigger adjustment first it might have just been adjusted to fine and maybes this was the reason for giving it away ??? But sounds like it wouldn't mind a strip and clean new lubes etc

[averageplinker]

Also check to see if the barrel has been bent upwards by accidental discharge whilst the action was broken.
Rich.

[Shed tuner]

I get what the guys are saying about possibly not needing a strip, but whenever I get a new-to-me springer, I strip and service as a matter of course.

They are easy to work on (I'm talking convertional guns here not exotics like GISS / sledge / schmeiser / annie 250s etc) and problems may not be immediately obvious just from shooting them. THis may prevent more serious problems developing, and gives you a good known baseline, and a level of confidence in your kit.

As evert's post, in this instance I'd just NEED to know that the sears hadn't been reground / modified / worn, even if an adjustmnet appeared to solve the problem, to have any real confidence in the safety of the gun.