Beretta 626 Onyx Review, Shot very little and great looking wood. The 26 inch barrels are chambered for Beretta Model 626 Onyx Description: 20 ga. From Beretta’s 680 line, the Beretta 686 was produced between 1987 and 1993. Beretta 626 ONYX 12 Gauge SxS for sale online. I was at the local candy store today and they had a 686 Onyx ProO/U only. ) Gauge: 20 Gauge, 3" Chamber Action Type: Conclusion: As you consider purchasing or selling a BERETTA 626 ONYX, it's essential to stay informed about the current market prices and trends. Tillv. Buy and sell new and used 12 and 20 gauge 626 models, including 626E and 626 Onyx, on the UK's trusted shooting marketplace. Scarce side by side model with 26 screw-in choke barrels and exceptional w (s2526) at Collectors Firearms - Buy My wife has a Beretta 626 Onyx that was gifted to her by her grandfather some time ago. Among them are a couple of Beretta 626 Onyx side-by-sides in 12 and 20 gauge.