Well, if the AR mags would have fed “just fine in the (my) factory predator stock”, I wouldn’t have bothered to try finding another solution. Maybe I just got a lemon?
The problem with mine is not that the nose gets too high, it’s the rear of the case gets launched when it clears the feed lips, driving the nose down and getting wedged in the throat of the feed ramp.
And the AI AICS mag feed lips are further forward than the Magpul AICS feed lips. At least the part of the upper lip that holds downward pressure on the round is.
Having said that, you may be entirely right, that this is just a feed lip issue. So, I look forward to you getting yours up and running and see what you can come up with.
The problem with mine is not that the nose gets too high, it’s the rear of the case gets launched when it clears the feed lips, driving the nose down and getting wedged in the throat of the feed ramp.
And the AI AICS mag feed lips are further forward than the Magpul AICS feed lips. At least the part of the upper lip that holds downward pressure on the round is.
Having said that, you may be entirely right, that this is just a feed lip issue. So, I look forward to you getting yours up and running and see what you can come up with.