So I just found out about this adapter that will make my AR into a quick-release Barrel configuration. However I have the original Smith & Wesson sport AR which has the plastic two piece front hand grip and the standard AR front post sight. I have been told I need a free float handguard with a gas block to replace my hand guard and the gas block to replace myfrontsight which acts as the gas block and currently. I will also need a front flip up sight that will be the right height to co witness with my current Stock rear sight. Any recommendations on a good lightweight front free float handguard for the stock 16 inch barrel. Also I would like a gas block that fits underneath the handguard as well.