I had a CalSci Large, which was 4" taller than stock. This was better than the stock, but it is too narrow at the top to prevent turbulence around your shoulders/ears. I now have the Rifle +5 +4, and I can actually run without ear plugs except for the high pitched gear whine of the counterbalancers. The angled spacers, more curve and more width at the top fixes everything. The extra air flow underneath is great. However, it is a great foul weather shield, and when it gets hot, you might wish you had more air flow (raise it 2" and air flows under the sides). So, I also have the Baker Air Wings to bring in more air. See you in a couple of weeks or so.