Just recently bought a 15-22 Sport, primarily because of its lightweight and adjustability for my pre-teen grandson to use. I've been looking at the Tippmann Arms M4-22 rifles for a possible new addition. Since so many features seem to be Mil-Spec, these days, I'm wondering if there is compatibility between the S&W 15-22 and Tippman mags? Both offer 10 and 25 round polymer mags. Anyone own both?