The upper fixes to the barrel and houses the bolt carrier group (BCG) and charging handle. The classic carrying handle with an integrated rear sight is mostly a thing of the past. On most of today’s uppers, referred to as A4-style uppers, the handle has been replaced by a top Picatin...
The following diagram illustrates the natural gas gathering, processing, fractionation, storage and transportation process, which ultimately results in natural gas and its components being delivered to end-users. Natural Gas Transportation Lines/Storage/LNG Facilities Gas End-Users Wellhead (Onshore and ...