I went out yesterday and picked up a Mossberg M590A1. Love this gun. It handles extremely well.
I'm left handed also and this is just one of the reasons I went with the Mossberg, the safety is on top of the receiver and easily actuated with your thumb.Where is the safety. I'm left handed and my Stevens is on the back of the trigger guard. When shooting a lot my trigger finger gets ripped up because fire extends the button to the left side.
I'm tempted to give it away just to have an excuse to replace it.
The bayonet lug is only on the 20" 9 shot versions.Bummer. No bayonet lug.