So I'm almost ready for SR.

There was a test floating around somewhere I read by Keith and Linda at milcun that still showed change of poi even with a free float tube on there believe it or not. For me, when there's one or two points between winning and second, I'm not going to risk using a sling. I was teaching in a DM course and we saw huge changes when using a bipod too. Like a foot or more at 100m.

This is true. The results depend on the float tube. I did this test with a collimator. A non-free float moves an outrageous amount with very little sling pressure.

monolithic or one piece uppers show no shift, but there is a weight penalty.
 
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