A few weeks ago I bought a Mag-Cinch for my AR (I know I "need" two).  I set them up as directed and tightened them down hard.  Here's the trouble; If I'm swapping mags and manage to get the lower (first in) mag on the reload it moves up to at least even with the fresh mag.

Are these things supposed to move like that? Am I slapping the bottom of the mag too hard?  Or did I just FUBAR the tightening procedures?

I havent trimmed the excess matrial off yet FWIW.

Sounds to me like the straps are not tight enough. My mags do not slip no matter how hard I slap them in. Really tighten those staps down. I used the cinch tool on mine. Are you using it? I seem to recall that some others were having problems tightening the straps properly without the tool...
HTH.

Quoted: Sounds to me like the straps are not tight enough. My mags do not slip no matter how hard I slap them in. Really tighten those staps down. I used the cinch tool on mine. Are you using it? I seem to recall that some others were having problems tightening the straps properly without the tool... HTH.

I wasn't aware of the tool I found one.  I guess I'll order it.

Thanks!

Use a pair of needle nose pliars and take up all the slack.
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Quoted: Use a pair of needle nose pliars and take up all the slack.

I tried that.

I tried the pliers, too. No dice. Found that the tool worked very well, and its multi-functional!