I have an AR15 with a PSA upper and stainless barrel. Just last week, I upgraded it to a freefloat tube like the one I have on the AR10 and I am surprised at how much difference it made in the accuracy.
I put a Wilson Combat adjustable gas block on the AR10 and I am not impressed. With the screw all the way in, it still will lock the bolt back on an empty magazine. I should be able to make it shoot single shot with it closed off. On the AR15, I used a Syrac low profile adjustable gas block and it is SWEET! It has detented adjustments that are easy to set and relocate.
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