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by Michael, from FL, United States Asked on September 23, 2021
The spacer that comes with the scs is for a rifle length tube. This 3/4" spacer is for an a5 tube, or an armalite spec ar10 tube, both have the same length and are 3/4" longer than a carbine tube. 308s can use any buffer tube length and the scs, or a carbine buffer/spring, with the right spacer.