if you're going to suggest sizes that ONLY work with high spring back metals PLEASE SPECIFY. i tried to get 16swg 5/16 and 18 3/16 which DOES NOT work for aluminum but this was the only place i could find with actual sizes and not just AR. the tutorial would be good but i just wasted 30$ on rings that i now have to find a different use for and consequently can't even follow the tutorial because of it.
