Nozzle hitting feed lip (Hi-Capa Xtreme)
 

Couln't find anything on Google or here so here it is:

I bought 3 brand new TM extended Hi-Capa mag. @ of them work fine, but when I insert the 3rd one and try to manually cycle the slide, the nub under the nozzle hits the feed lip just under the BB, stopping the slide from moing forward. Thought?

Posting your question in this thread may get you an answer quicker from the Hi Capa master that is ILLusion.

I'd think there may be some flaw with the magazine, but not having it in my hands, I couldn't tell you this for certain. For what it's worth, I have not seen nor heard of this problem before.

If 2 work fine and one doesn't then I think Illusion is more than likely correct that there's some flaw in the mag. Perhaps replacing the feed lip may help.

I'll try interchanging the feed lips between 2 mags and see what happen...