Has anyone seen a ported DR pre-WWII like this one that Kirby has listed?

https://www.vintagedoubles.com/catalog/?sort=5

Gun ID: 4851



What kind of knock does it take for the addition.

Too, I can't put my finger on it, but the front sight has multiple functions or similar.

Serbus,

Raimey
rse

Looks to be a flip-up moon sight; it's up. I would be nervous about the regulation with those ports, Kirby would probably let you test fire it.

Moon Sight. Indeed, that just well may be it. Yeah, those port holes make me quite nervous also. I always thought those to be on a Ship??

Serbus,

Raimey
rse

Raimey,
I have never seen such porting on a double rifle, in fact it seems to have been done with common gunsmithing/machine shop equipment instead of EDM. The Scope seems to be a recent addition and mounting a scope on a double rifle is pretty commonly known to change the point of impact of the bullets. A possible intention of the ports would be an attempt to correct "regulation" of the barrels. The cartridge the rifle is chambered for is not known to generate enough recoil to justify porting for that reason, plus the ports do not seem to be located to control " muzzle whip"(vertical). The location seems to be an attempt to correct regulation of a rifle shooting "wide", as opposed to "crossing". Only shooting it will tell the tale. As always, I may be wrong.
Mike

I think you to be correct, Ford.




A little grainy but an oval porting on a Scheiring DB .470(above) two barrel set w/ 8X57R)lower), non ported.




Another view of the oval port on the 470 Nitro

Serbus,

Raimey
rse

Same 470 Nitro DR with 2 oval ports.

Many thanks Wolfgang for all the search efforts.


Serbus,

Raimey
rse

But look @ all the amazing components and machine work.






And this is just the frame......


Serbus,

Raimey
rse