Unpacked and found: The cock locked not as it should. It straddles the cock, this should catch, then pressed to the trigger and the first dart flies. Repetition, second dart. So the theory. But by my Double Strike, this cock is not locked up. So be unscrewed and inspected. The small pin on the lock is broken cleanly, he follows exactly the clamping movement, like a kind of breaking point and can not be serviced by superglue, because the tension in this part of the enormous spring is quite large.
We come to the pro: WHEN ALL IS HOLDING, shoots the DS really far, there have just been tested with the hammer cocked, released this and the result is convincing. Too bad but if you have a damaged product.