The front sight locks in both the up and down position and can be moved by pressing a button on one side. The mounting design may not be as sturdy as an A2 with tapered pins, but it is a lot more durable than running two set screws like we have on most rifles these days. These gas blocks are well known in the MK12 cloner world but are still a great option even to this day. Next, we have a Precision Reflex Industries (PRI) gas block. Time will tell if we end up installing one, but more on that later. The cool thing about this barrel is that it has all of the correct cutouts for a 203-grenade launcher. It is one of the best flash hiders on the market and an excellent suppressor host. Starting with the muzzle device, we have a SureFire 3 prong flash hider. We could talk about the good old days of COD but instead, let's break down the gun itself. Hailed as the greatest Call of Duty game ever, it seemed fitting to source the parts for this build. This Call of Duty Modern Warfare 2 rifle, for example, will spark memories for many of us. Today, movies still shape interest in guns but not to the same extent that the videogame industry does. Then, their children watched WWII movies and found a fascination with M1s and Thompsons. Previous generations watched cowboy movies as they grew up and fell in love with revolvers.