In a blowback, the bullet goes one way and the slide goes in the other and the barrel stands still...and the expanding gasses move both.
Which is why the HK P7 will still cycle without the extractor. But most are convinced it's some uber secret technology that HK built into the gun.
On a side note, this is why grip angle and bore height make a difference in the "felt" recoil of a weapon. The amount of force expended is the same assuming the same bullet loading and weight of the components. But you are changing the fulcrum and the length of the lever.
And I thought I'd never use that stuff after high school?!
"The 1911 was the design, given by God to us through John M. Browning, that represents the epitome of what a killing tool needs to be. It was true in 1911 and it's true now." - Col. Robert Coates commanding, U.S. Marine Corp Special Operations Command Detachment 1 (DET 1)
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