The Montefeltro 20 gauge weighs 89.6 oz — 5.6 lb — which is light even for a 20 gauge semi-auto. The gas-operated Beretta A300 Ultima 20 gauge in this same category comes in at 108 oz. That 18-oz difference is noticeable when you're carrying a shotgun through the uplands for several hours. Benelli achieves the weight through an aluminum receiver and the inertia-driven operating system, which has no gas ports, pistons, or magazine tubes to add bulk.

The inertia system is mechanically simple — the bolt cycles by using the rearward force of each shot, so there are fewer parts to clean or replace. The trade-off is that the system needs minimum cycling impulse to function reliably. The spec sheet calls out a minimum load of 2-1/2 dram, 7/8 oz, which rules out the lightest 20 gauge target loads. Most hunting loads run well above this threshold, but owners report occasional short-cycling with new guns on light loads until the action breaks in past 100–150 rounds.

What you get at 5.6 lb is rare. Most semi-autos this light cut a corner somewhere — reliability on light loads, fit adjustability, or build quality. The Montefeltro includes a shim kit for drop and cast adjustment and ships with three Crio choke tubes, both features more common on higher-end over/unders. The flip side of the light weight is recoil management: less mass means the gun moves more on the shot, and some shooters find the Montefeltro requires more discipline in follow-through compared to heavier alternatives like the Ultima.