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Great info, very much appreciated. I followed the instructions but got stuck trying to remove the air cylinder. Tried to twist it, firmly but didn't turn. Any ideas on how to unscrew that blessed air cylinder so to insert the regulator in? Thanks in advance folks, 

Congrats Centercut, great post about Huma regulator on Daystate Renegade. May I ask which technique did you use to degas the rifle?