I bought my son a LH M2 in 20 gauge and it's certainly a nice gun - it was the only LH SA 20 gauge I could find - but after shooting it a while we realized that whatever reason they left the release button on the right side of the receiver. This is a major PITA.This is what I bought my LH son and it's been flawless (20ga). Now that he's bigger, I bought him an A400 12ga for waterfowl).
I agree that Benelli messed up with the placement of the bolt release. I'm sure it's was done this way to cut costs. If you look at the trigger group I'm pretty sure they are the same between the two versions also except for the safety being reversed. I've gotten used to it over the years and it's a non issue for me now, but I'll admit it was nice having everything on the same side the year I tried the LH A400.I bought my son a LH M2 in 20 gauge and it's certainly a nice gun - it was the only LH SA 20 gauge I could find - but after shooting it a while we realized that whatever reason they left the release button on the right side of the receiver. This is a major PITA.
On the RH version, the button is just below the port, and it can be easily closed with the right thumb and the lever is never impeded by the rest of the right hand (ie if the gun is in your right palm, the fingers are on the other side of the receiver).
On the LH version, the port and the lever are on the left side of the gun, but the button is still on the right. If you try to close it with the right thumb, the lever hits your fingers on the other side. Theoretically, you could hold the gun in your left hand and try to close it with your left index finger, but ergonomically that's hard to do because the left thumb still tends to get in the way of the lever.
I'm sure there's some reason they did it this way, but it seems like an oversight. If they can reverse the port and the bolt lever, they could figure out a way to reverse the release button, too.
As I said, it was the only LH semi-auto I could find in 20 gauge but I would recommend against it at this point if you have another option.
Pictures below to show what I'm talking about.
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On the Beretta they did it correctly, but it's not available in 20 ga as near as I can tell: View attachment 35680