Blocks look the same. Sorry for the cr@ppy photo, but you get the point. The groves are machined the same so they will ride over the magazine lips. The bolt intrudes over the ejector slot by 5/16" at best. I think milling the safety slot 5/16" farther aft on the tube would solve this problem. I'll call Jason and see what he thinks.
https://www.milsurps.com/images/impo...mparison-1.jpg