I might've been missing something from the first post, but I was wondering why the Accurate Mag BM was needed with an XLR. They're already milled for the default AI magazines, no? I have Alpha type 1 (.308) and type 2 (WSM) for the McRee/model 10. I had to relieve a little magwell material to get them to insert easier. They still won't drop free, but with the longer length mags it's easy to grasp and pull. Plus, the Alpha mags are a little more accomodating longer OAL.