I had the extrema and then when the extrema 2 came out I got it and have never looked back. I used to hunt with a Brownning BPS, it was much heaveir and I felt slower on my swing with that gun. I know most Beretta's are built to last I have had 3 all together and never had a problem with any of them...The extrema 2 is all I use for everything from doves, ducks, skeet...Sorry I could not help more on the 3901.
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