Okay, My son found this for me, as he knew my rifle was acting up, or not firing properly..Video is at Vickerstactical.com. It is by Larry Vickers at Obendorf, germany-- Mauser museum..The video is lengthy, I have only watched until he shoots the pistols..The part I like was watching a cutaway G-3 rifle in action..this was also used in HK-91 and others...I have to say the .223 G-36 looks to be a tough rifle to beat..Enjoy. OG.