i have a YHM free float rail on my 9mm ... it works perfect. No movement at all.
I believe the reason why yours is twisting a little bit is because you might have a 2 piece hand rail which needs to be attached to something at the end towards the barrel.
The VFG (vertical forward grip) actually amplifies the looseness of having a 2 piece handrail. Kinda of think of it as like a ... tire iron... the longer the handle is, the easier it is to torque (does that make sense?)
I hope this helps??
Here's mine
norman
Spike's Tactical Sales Associate
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