My guess is they are "Piani Fissi" or "Pianio Fisso"barrels.
Don't know the English word.
For the price of an Upland Gun Company/R.F.M. not likely to be Chopper Lump (in Italy "Demi Bloc).
But maybe some R.F.M. models are really Chopper Lump.

The Upland Gun Company site says the Zeus are Mono Bloc and Venus are Chopper Lump.
I respect Johnny Carter but I think R.F.M. may have given him the wrong info.

For the price I bet they are really the same construction I have on a Bernardelli Roma 6 and the Rizzini BR550.
And same used on the current Beretta SxS they call it "Tri-Bloc"
Maybe I should not be so sceptical - but have reason to be.

Effebi Piani Fissi

Beretta Tri Bloc

Upland Gun Company


Only way to be sure is to look at the barrels to see the Chopper Lump Seam.
As per the Hallowell info.
Hallowell Lumps.

Last edited by Beccaccia28; 01/21/25 05:54 PM.
Upland, grouse, woodcock