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From experience and from advice, you should try to locktite all the screws and pins. The vibration from firing shakes everything loose and causes problems. The buffer retention pin will unscrew high enough that the BC will get caught in the buffer tube and can cause what you are seeing. Keep trying and it will get stuck to the rear. The nozzle guide will become loose and will make it hard to rack the BC. The gas key will also become loose.
Turok has a great guide on some mods to get better movement out of your bolt carrier.
You might consider removing the AL nozzle and putting it into your stock BC.
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