Modifying Alpha Mags for Manners mini-chassis

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Can someone point me in the right direction to modifying Alpha mags to fit in the MCS minni-chassis. Just by looking at it, the corners need to be shaved down but I don't want to ruin my mags. What methods have you used to make them easier to load in the chassis? Any help would be greatly appreciated. Thanks

 

[Trevor300wsm]

I've never had to modify the Alpha mags I used on my 7wsm in the manners mini chassis' that I've used.

 

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I have 3 mags that I bought couple years ago and they are SNUG. My one new mag I received last week, goes in good. The other 3, I can't pop em in like the new one or the 5rnd that came with it. I'll trim the corners and see what happens.