Try to insure the follower is correctly installed and the spring id in its proper place as well. More importnatly ensure you fully seat each round as you insert it into the magazine, make sure it is all the wya to the rear as well. Also inspect the top lips of it.
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www.rifleshooter.com
They are available but they are EXPENSIVE!
how about $65, plus shipping? Yep, that's right.
Unfortunately only Browning makes them.
Good luck
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Don't tread on me!
Pennsylvania Frank