My M48 is throated long with a standard box, you're right...I can't reach the lands with anything that'll fit in the magazine.As long as you only shoot factory ammo through them they are probably great.
I've loaded for a couple and the magazines boxes are very short but they are throated longer so you can't get anywhere close to the lands because of mag box.
To me, coming from a company that built their entire name on bullets and reloading they failed terribly.
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