I've had mine about a year now, great gun! As someone posted, before you buy it, try it. Put it up a few times, maybe even try something else that's equivalent, put that one up to your shoulder a couple times, then go back to the A5. Far as fine tuning, it comes with plenty of shims. For some reason, I did need to use a shim. Otherwise, a tad noisier than my SBE, but smoother, its easy to clean, and love the auto load function (need to get familiar with it, or it will get a finger). The only thing I didn't like was the charging/operating handle, a little small. So I switched it out with a aftermarket oversized one. It is so nice I switched my other ones out also. And to be very honest, I pulled it apart after the first two times out, just to take a peak, looked great, assembled it. Between the waterfowl season, pheasant farms and sporting clays, gotta have 500 rounds through it and not a glitch. That's everything from 3 1/2"-2 3/4". If it feels good on your shoulder, you'll love it.