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by Bill, from TX, United States Asked on March 20, 2022
This Guntec USA AR-10/LR-308 Full Size A2 Rifle Buffer Spring Set is only compatible with A2 rifle length stocks. You are looking for an A5 system, which is rifle length and allows you to use adjustable buttstocks, but also requires a specific buffer. I would recommend using the V Seven 2055 Carbine Buffer Tube (linked below), and the V Seven Enhanced Teflon Coated A5 Buffer (linked below).
https://www.opticsplanet.com/v-seven-2055-carbine-buffer-tube-a5.html
https://www.opticsplanet.com/v-seven-enhanced-teflon-coated-a5-4-6-oz-buffer.html