FTF and offset primer hit - what is going on here?

[Rappahannock]

I'd like advice on this situation with a Browning BDM, the 90s wunder nine that never got very far. It is an excellent pistol that has developed a failure to fire, then fires on with a second hammer blow. The shells demonstrate an oddly offset hit on the primer once it does fire.

I am assuming this is the result of a tired recoil spring not bringing the slide back into complete battery - do you think this is true? New springs are incoming from Wolff as the first step in correcting this problem and I am hoping nothing else is going on.

[JBP55]

There is a good chance the new recoil spring will correct the issue as you said.

[Nephrology]

Is the pistol fully in battery when this occurs? Like the above said, a new recoil spring might lock it up aggressively enough to prevent this from happening.

[Bob Hostetter]

This is normally the result of the barrel being fit incorrectly.

[Rappahannock]

This is normally the result of the barrel being fit incorrectly.

That would be a good explanation, but the pistol operated flawlessly for some time before this started happening.

I found some original factory springs (there seems to be only once source for parts for this pistol) and will try them before going to the aftermarket.