What I am sticking to with this rifle is to have an all purpose lightweight 20" rifle. I have a 20" gov profile upper I want to free float to increase the level of accuracy which can be counted upon. This will be my first upper work though I have done a few lowers. I am looking for suggestions on a lightweight aluminum free floating tube or handguard to install. I am not looking for a quad rail, though the ability to add a rail at the front later might be something I would want. Looking for reliability and lightweight as the top priority. Second, I am not sold on the fixed front sight gas block which is currently there and was wondering if I could replace that while I am at it with either a railed gas block which could accomodate a folding front sight, or just a lopro gas block. First time with this hence the questions. Thanks.