Weapons How Does it Work: Gas-Delayed Blowback Forgotten Weapons How Does It Work: Lever Delayed Blowback Forgotten Weapons How Does It Work: Roller Delayed Blowback Forgotten Weapons How Does It Work: Toggle Actions Forgotten Weapons Radial Delayed Blowback Radial Delayed Blowback Information about the TZ45 submachine gun and the concept of advanced primer ignition Blowback action, Animation and explanation at howstuffworks.com Heckler and Koch USA now uses the "roller-delayed blowback" terminology Blow-Forward operated submachine gun patent Blow-Forward firearm patent Kewish primer actuated patent (1/4 assigned to Garand) US1603684 Garand patent making reference to earlier primer actuated application in 1919. Burke v US, 67 F.Supp 827 (1947) has comment about Kewish and Garand. What Does Blowback Mean In Airsoft? Firearm actions Firearm terminology