Most will tell ya to stay clear of the AR7. I'm assuming you're talking about the AR7. It floats because the stock is filled with floatation foam. It comes apart and stows in the stock, so it don't even look much like a gun when you pack it away. I have owned two. First one got ripped off and I bought another from a friend for cheap. Both of 'em work, go bang every time. It's only about 1" at 25 yards accurate even with a scope and the trigger sux, but it's a neat little take along on a water adventure for sure. I bought my original one because it fit so easily in motor cycle saddle bags. I don't really shoot it much, but it's very compact to take along and it only weighs about 2.5 lbs which is important on a Kayak as most have a limited weight rating.
Now, two tips, if it's not feeding reliably, 99 percent of the time it's the feed ramp which is integral with the magazine. Bending it in or out will fix the problem. Also, there are tutorials on the web, google it, but some have claimed that giving the chamber mouth a slight chamfer helps reliability if you're running into stoppages. I've never done that, not had the problems that adjusting the feed ramp on the magazine didn't cure.
Lots of folks are total idiots, though, and if it don't feed out of the box, they call it crap and move on. Whatever, but the gun is quite reliable when it's working, feeds just fine, at least my two have. If it don't feed, it's easy to adjust and fix. It's a very simple design. They're a very niche specific type of gun and it sounds like you are the niche they're specific to.
Not the gun I grab to go hunting with unless that involves getting there on the motorcycle and, now days, I usually hunt small game with my handguns. 20 years ago, I used the AR7 a lot. It's killed quite a few squirrel and one raccoon I can remember from about 50 yards.