I made a few final changes to my Regal XL. I didn't feel like the Airstream silencer was all that great, so I ordered a spare shroud assembly and a Donny FL Tanto. Let me say that Donny FL deserves ALL of the praise that he receives for his well-machined parts. This Tanto is precision made and extremely well finished. I also made a significant difference to the sound moderation. It's more of a hushed sound now, and MUCH more quiet than the airstream. It also looks WAY cooler. I never liked the look of the airstream.
Also, I felt like I was constantly adjusting the rifle into my shoulder at the last field target match. I realized that some downward adjustment may help. I installed one of Rowan Engineering's adjustable buttpads. They did forget to tap 2 of the screw holes, so they sent me a tap so that I could properly tap the holes myself. I had to buy a tap handle on my own, but now I know how to thread a hole, so I'll think of it as a bonus rather than an irritation. I didn't really like the look of the red buttpad with my stock, so I opted for a Maccari Eliminator pad. The kit was very easy to install. Lowering the pad about 3/4" made shouldering the rifle much more comfortable.
In short, I'm extremely happy with both parts!