ATRS Modern Sporter... Some Initial Observations

Do you find that Luth-AR stock wobbly on the receiver extension?

On a mil spec tube, yes. Until you tighten the screw.
On a commercial tube, not really no.
I have a couple of them. Bought them more for the adjustability but I have taken the cheek risers off both for now.
 
Thanks for the video. Clears up the explanation as to why the CH track can't change.

Mine Raptor takes a little more force than that, enough that you couldn't easily do it with on finger, but it's exactly what is happening. Perhaps different handles will be effected differently. Again, it's annoying, but totally workable.

I'm running a Raptor LT, mine is about the same as the Geissele in the video. I haven't tried other charging handles in my MS though. I've run the Raptor for years and have them on 6 of my uppers.
 
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