7 lbs is excellent for a long rail like that! Not much more than my LW DD upper with MOE furniture.
I went with optics ready in my ArmaLite upper (railed gas block) but like MJ have found the fixed front sight base on my DD upper not to be a problem with my 3-9x40 scope or RDS.
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The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
You'll remember the quality of a gun long after you forget how much you paid for it.
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US Army 1966-69, VFW Life Member, Retired Geek
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