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Hi, and thanks in advance for any help. I'm starting to gather parts for a build. I want to do an AR15 with a 20" wylde barrel and a 1:8 twist. The reason for the 20" is, many years ago (may be a factor) in the army with an m16a1, I was hitting pop up silhouettes at 400 yds. Going to the range now with a 16" barrel/magpul pro sights and I can just hit paper at 150 yds. I like the look of a collapsible stock and also the fact that the pin can be drilled out should I move out of our peoples republic state. Now to the question. While unsuccessfully looking for a rifle length extension tube that will accept a carbine adjustable stock, I ran across a few threads on other forums that addressed the issue by saying: use a carbine tube setup with an H buffer. My question is.... will this setup reliably cycle and not beat up the moving internals? And two, what would be the best buffer for 20" barrel with a rifle length gas system, H1, H2, H3? And last but not least will the standard carbine buffer spring work or is a heavy carbine spring needed with the heavy buffer? Thanks again for your advise and wisdom.