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Tubes is going out in todays mail.I have specs for my gas block tubes. Max length of 5.750" from tip to gas block shoulder that touches the barrel.You can cut an inch off the tube and adjust the length.I made barrels for Tromix that had the gas block area 3/16" farther away.So there is some slack.At the 5.750" spec tube is about .085" from touching the inside of the key.The tube goes into the key over .8" deep.
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