I've got an older police 870 that I'm putting a mag extension tube on. Before I do, I wanted to get some input from folks that have used both a one shot and two shot extension with respect to overall balance and weight of the gun. This will primarily be a home SD/range gun and I don't want it weighted down too much or thrown off balance. The price for both extensions is the same so I'm looking for feedback from folks to see if they noticed a difference btwn the two as they moved around and/or shot. It's kind of like some folks who have a 590A1 that say they love it but it's too heavy to lug around and for making quick shots. So what are your opinions from real-world experiences?