We rented guns from the outfitter. We used Beretta 391's in 20ga. Outfitter said they last about a year before they are worn out. We had two crack the frame in the week we were there. Guns were cleaned during lunch and again in the evening. The outfitter felt they were the 2nd best gun for this type of high volume shooting. He liked the Cordoba model Benelli better but that model cost him twice as much and although they lasted a little longer they did not last twice as long. I shot 3500 shells in 6 days, they shoot like this every week for 10 months.
