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Hey guys, I'm doing a lightweight AR build for my girlfriend and have been looking at stripped uppers. What I found surprised me. I was searching for a "slick sided" upper to save weight. The 1st I found (and really only truly slick upper) was the DPMS Low Pro Upper. The site says it weights .66 lbs = 10.56 oz http://www.midwayusa.com/product/138383/dpms-upper-receiver-stripped-ar-15-low-profile-flat-top-matte The 2nd item I found was the Spike's Tactical SlickSide Upper. It has no FA but does have a deflector and dust cover. listed 7.26 oz. http://www.spikestactical.com/new/sss/upper-reciever-m4-slickside-no-forward-assist-multi-cal-p-926.html The 3rd item I stumbled across was the regular old Daniel Defense A4 Upper. It has all the bells and whistles and comes in at... 7.00 oz. https://danieldefense.com/components-parts/stripped-uppers/a4-upper-receiver-assembly.html So, what gives? I expected the less goodies on the Upper the less weight but these 3 examples are the opposite! Obviously there is no real trick here and the DPMS design is simply bulkier or the weight isn't precise. Daniel Defense's motto is LIGHTER, STRONGER, BETTER... and it looks like they may have milled out some material underneath the picatinny rail. Still, I was surprised at what I found.