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I had the same problem installing mine a few months back in terms of the inner barrel not wanting to seat all the way forward. What I did was I took the inner barrel and inserted it in the opposite end of the outer barrel, and worked it in circles to round out the opening (make it larger) DON'T be too rough though.
It's a tight fit, but after a while I was able to push it all the way in and get the pin to slide through and hold it in there. I was afraid to force it in but in the end thats what's needed, but again try to be careful around the hop up rubber.
As for the hammer problem.... I never encountered this. Was the problem maybe because the inner barrel was not seated properly within the outer??
Hope that helped
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