A smooth shooting, long lasting auto shotgun, the AL391 Urika MAX-4 HD features the most effective and up-to-date camo pattern on the market — no matter which flyway you shoot on. The AL391 Urika Max-4's new SCS (SPIN-CLEANER SELF-CLEANING) Valve piston, functionality improved by 40%, maintenance interventions reduced by 50%. The new piston features numerous innovations: Four flexible tabs which positively adhere to the gas cylinder walls and adapt to the pressure of the different loads, a high number of self cleaning scraper bands, scraper bands on the piston guide bushing which clean the piston, scraper front dents which keep the piston clean from the combustion residues and four angled slots on the piston walls which induce its rotation. Beretta’s well proven, self compensating gas system provides just the right pressure for a wide range of loads, while the Optima-Bore overbored barrel cuts recoil and improves your patterns.