I am in the process of putting together a CMMG compete upper via its website - http://cmmginc.secure-mall.com/shop/?cart=1504960&cat=27& The purpose of this rifle will be general plinking out to 100-200 yards, nothing too hardcore. I do want it to be as accurate as can be, within my budget. I will be putting some very decent optics on it. Think accupoint. 1. I will be going with a 20” barrel, the ones at the very bottom of the page linked above. What is the difference between the MedCon and the Government uppers? Any reason to choose one over the other? 2. These 20” CMMGs obviously use a rifle-length gas system, correct? 3. My main noob question: I do not want or need a front sight, or the post, or anything. There is no option for “no front sight” or “no front sight post”. If I leave the sight post option as A2 post, and then choose under Front Sight Base/Gas Black Option the YHM 4 rail gas block, or the Micro Gas block, for example, the rifle will not come with a front sight, correct? I would assume so, but leaving the sight post option as A2 post makes me freaking nervous. Many thanks.