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dr, interesting thread. The only additonal idea that MAY be benefitical is that, your barrel may not actually Free Float. Maybe a picture if that is possible. I saw a Ar with a advertised "free floating" fore piece and it was attached to the rear and just before the front site on the barrel. I would think any attachment forward of the chamber would defeat the idea of a free floating barrel. Check your barrel nut besure it is tight.
On all of my free floating barrels nothing touches the barrel forward of the chamber. No slings, bi pods (not a fan of them) or fore piece.
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