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Let's all be perfectly clear.


You have a carbine buffer, with a carbine spring, in a carbine buffer tube, correct?


If so, next stop is gas.


ETA:  Here is an explainer on M4 feed ramps, courtesy of Larue Tactical.


https://www.everydaymarksman.co/wp-content/uploads/2019/03/feedramp.jpg


  There is really only 1 combination that might cause you problems.   Pretty low probability on a 16" barrel.


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