Hmmm very interesting and nicely done. Which platform was your Mesa built for? I have one sitting in my parts bin that I pulled off a Mossberg 500 years ago and one of the shorty Churchill pumps with the raptor style grip laying around. Never thought of trying this.
Just for those asking the function has been extremely reliable, 500 plus rounds through mine. It's my main I dont care what happens to it, toss it in the trunk gun, hiking gun. Not the smoothest action but for under $260 very acceptable and it goes bang everytime.