Not an impact.........but a lone peak fuzion. My rigs a 6bra and feeds the first 7 rounds from an aw mag with hrd kit well, the last 3, not so much. But it's done this in every chassis/bottom metal I've tried. Bought it 2nd hand and obviously needs some tuning. I run arc mags with 98% no feeding issues. There's a small tab that's screwed in the top side of mag well rear inlet that keeps aics mags from putting upward pressure on the bolt. If you remove this it allows the aw mag to ride higher, could only be a good thing with these mags that offer low case head presentation.