Airsoft Outlet Northwest goes over the newly released KWA LM4 Gas Blowback Professional Training Rifle to give you a walkthrough and a takedown of this rifle. Here are excerpts... "Like most M4s, the KWA LM4 PTR has a railed receiver, and will accept any and all types of optics, from red-dot sights to ACOGs or other magnified optics. If needed for use with an optic, an extended tactical latch can be installed.