Badabing Pictures tries the Tokyo Marui AKM Gas Blowback Rifle fitted  with a BBF Hop Arm to check how it lifts. This comes with the with Maple Leaf Omega Hop Up Tensioner Nub. Mainly made of 316L stainless steel and weighs 30g... "The BBF Stainless Hop Up Arm for the TM AKM GBBR. Let’s see what it’s all about."