I'm not sure at what point your getting stuck at but,I'm thinking it's were the middle of the outer barrel is there are some set screws and if there over tighten they press on the inner barrel.I had the same thing Happen on my ICS M4A1,and I had to letoff on the set-screws to let the Inner barrel go in.It cost me a Hop-up to find out what happend.Hope it helps!
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