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I'm trying to design a new buffer system for an AR. What are the lengths of the carbine and rifle length buffers?
 

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You mean the buffer tube, aka receiver extension, correct? The buffers themselves vary in size, shape and mass.

Internal length is about 7" for the carbine, about 9 5/8" for the rifle. External length on the carbine tube varies a bit, some are longer than others. Do not forget the exterior diameter difference in the rounded portion of the commercial/mil-spec buffer tubes as well.
 
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