r/canadaguns • u/Over_Independent8887 • Apr 12 '26

Fix my gun FAB Defense magazine problem

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I have those magazines but for some reason something is wrong and they just don’t work in any 5.56 rifle I tried.

The bolt just gets stuck on lips somehow and doesn’t even touch the round to feed.

I would appreciate if anyone could share their experience. I am sure they are good brand and should work :)

Thanks !

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u/Hellfrozeover666 Apr 12 '26

The notch at the back of mag needs to be squared off. Take one apart and file the rounded bottom corners so they’re 90 degrees square. Reassemble and try it. If it’s still catching you may have to go a bit deeper. Once you have the one mag cycling properly you’ll know how much to remove on the others.