One small correction here, the BRNO SxS, extractor model, available in both 16 and 12 gauge, is called the Model ZP-47, regardless of gauge. The ejector guns, also available in both 16 and 12 gauge, are the Model ZP-49. I have in my files an original BRNO magazine ad from the 1960's, showing both model designations. A true sidelock with all coil springs. They are so tough that I have built two double rifles on them, one in calibre .450 #2 NE, the other in calibre 9.3x74R. Both are still going strong after 1000's of rounds through them.
