Barrel Choke/Crown to tight .

[Vard]

Hello All,
Working through a GSX100 I've just picked up.
Outwardly in very good nick with a hint of bodgery inside .
The barrel......
Strange one this. Seems to shoot well enough when I first tried the rifle .
But  now I've had the block apart for a clean up thought I would rod a pellet through.
Alls ok until we reach the end where we get to the choke which is initially as you expect with a bit of resistance then we come to what feels like a ridge .
Almost like the very end has been peened over .
Pic shows end of barrel with pellet at point where the ridge is.
Is this some kind of crown or is it a bit suspect ?
Some might say if it shoots ok leave it but cannot help thinking it's having some impact on accuracy/energy.
Any advice /info welcome.
Thanks,
Vard.

[Mickyd]

Can you see anything, that looks odd.md

[Vard]

Am yet to get the magnifying glass on it but it definitely feels too restricted just as the pellet head reaches the very end of the barrel.

[KevG]

I would try giving it a good polish out with autosol,it won't get rid of the ridge but it may smooth things out a little.would be careful though if its shooting ok already
KevG

[Vard]

I may have a go with the Autosol Kev but I'm worried about keeping any polishing concentric.
If I can find some way of rigging it up so I can rotate the barrel at same time might give it a go.