I agree! My thoughts are that perhaps it have been resleeved from a 20 or 28 gauge to rifle barrels in 1984 (I think it’s 84 rather than 99 because of wear, but it could be either).

Based on pictures online I’ve seen a resemblance to guns from Dumoulin but nothing is certain.

Thank you!

I look forward to shoot it!

/Byrackan