I studied the design and it looks to me its just a standard a2 stock with an integrated rear pistol grip that the rifle's buffer tube slides in. No spring at all, no return force except your own forward pull, exactly like bump firing. I just don't see how it holds itself against your shoulder when firing.
Edit: ah, you have to pull it into your shoulder with the pistol grip shield.
Edit: ah, you have to pull it into your shoulder with the pistol grip shield.
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