Beretta's A300 lineage traces back to the A301 introduced in the mid-1970s, one of the early successful gas-operated semi-auto shotguns. The A300 name was revived in the modern era as a mid-tier gas gun, and the Ultima variant — launched in 2021 — added the Kick-Off recoil reduction system with hydraulic dampeners built into the stock. In the 20 gauge configuration, that system runs on a platform that already produces less recoil than the 12 gauge version, which makes the Ultima a soft-shooting option for bird hunters and new shooters alike.

The gas operating system uses barrel ports to cycle the action, which requires more cleaning than an inertia system but cycles reliably with a wider range of load weights, including light 7/8 oz dove loads that can short-cycle inertia guns. The A300 Ultima 20 gauge weighs 108 oz, which is heavier than most 20 gauge semi-autos. The additional mass, combined with the hydraulic Kick-Off system, is what makes the Ultima feel softer in recoil despite the 20 gauge already being a low-recoil platform. Owners report the second shot gets back on target faster than with lighter inertia guns.

The 20 gauge version uses Mobil Choke tubes, a widely adopted standard with broad aftermarket support from Kicks, Carlson's, and Patternmaster. The safety is reversible for left-handed shooters. The synthetic stock handles wet conditions better than walnut, which is relevant for early-season dove in humid weather or late-season pheasant in rain. At around $900 street, the A300 Ultima 20 gauge sits between the pump alternatives and the Benelli Montefeltro — and that's roughly where it belongs in the field semi-auto hierarchy Beretta has been building since the A301.