Well i haven't shot it, but I'll try to explain everything i see messing around house with it.
Aluminum ends where you see circled in the picture
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BUT the way they did the forend is a solid box frame design. I'm a 220lb 20yr maintenance worker and I can't twist the forend just using hands on front and rear in any way.
Now if I use leverage... Grab barrel and apply force directly to the side of the forend I can get it to move enough that I can see it. Only way I can see this making a difference while behind the rifle is if you were to deeply wedge bipod into something and apply a ridiculous amount of pressure to basically torque the forend into a banana... Why anyone would do such a thing I have not a clue...
I took it out on the deck and got behind it as if shooting from barricaded positions. applied pressure to a single bipod leg and I can't see enough flex to amount to anything with any form of pressure I would apply while shooting normally.... Maybe if I was going to put this on a "go to hell" rifle I would rethink polymer anything, but I can't see where anything with this chassisis going to limit you in most cases.