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You can drive the pins out of fsb and remove it and install a different gas block and ff hand guard. You can also buy a short enough hg and re- install fsb. All this takes some experince and tools. I am wit da others on dis one. Leave it be and shoot the p out of it. You can always but another upper more to your liking later if it still doesn't trip your trigger.
Just a fair warning, if you undertake this and acquire the tools and know how it can lead you down a giant rabbit hole.
Thanks for the inputs/suggestions. What are people using for optics so the front sight is not in your sight picture?
Red dot on a riser mount works scrumdiddlyumptious. So does a scope in a one-piece.
To eleaborate a bit, a cowitnessed red dot with a FSB is great as long as you are not running body armor (in which case the higher the better)
When using a red dot you can keep both eyes open and focus on the target and the dot is superimposed over it. The front sight will all but disappear, however if the dot goes down, you can use the sight body like a giant ghost ring amd still use the front sight, or flip up your rear BUIS and go to work.
If using a magnified optic the front sight will be a barely discernable little blur in the bottom of the image.
Can cross eye dominant people keep both eyes open in this set up?