BDM makes a lot of great magazines, and the Gen III mags will feed well in your AR. Unfortunately though, they will not engage the Catch22 after the last round is fired because the spring tension is too weak and the follower doesn't extend up high enough. 

If you use this magazine with the Catch22, you'll need to manually engage the catch after the last round is fired.

We're working on a solution to make these magazines engage the Catch22 after the last round but it's still a work in progress for now.