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I have found it easier to cut a 25 Grr mag down to 17-20 rd.'s I make the floorplates. 2 cuts, 1 on mag. 1 on spring - drill 4 holes - add 4 screws=done.
I don't know if the flat springs makes the difference, but I do know I'll be making some more of these units.
It's nice to be able to sit at the bench, load one magazine and be able to shoot 4, 5-shot groups of different ammo, off of a low profile bipod without breaking your cheek weld.
It won't surprise me if ASC comes out with a "true" 20 round mag for the Grendel in the coming months.....
Thanks again to SG4247 for taking the time and effort to work this mod and share.
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