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Well, we need more information...
Is this 5.56 (I assume but if it is 9mm whole different topic).
Where is the gas port (standard pistol location?) and where did you get the barrel?
What kinds of problems are you having? Does it work in semiauto or is problems only on full auto?
What stock and buffer are you using? With a shorty, you may need a heavier buffer!
Have you modified your extractor yet... many people with teh ultra shorties have extraction issues and I would need to look up the fixes as the shortest upper I use is 11.5-inches so I have not had any issues...
My site is not as active as many others so if you want mre oppinions, try posting on the M-16 forums at ar15.com as there will be many more guys there that have experience solving these issues but I will be glad to help as I can... (here or there)
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