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+--- Thread: Upper assembly order (/showthread.php?tid=21662)
Upper assembly order - Disciple - 07-17-2020
With regard to assembling an upper using a barrel nut that does not need indexing. Can the gas block be installed on the barrel before the gas tube is installed in the gas block? It looks like there is room to slide the gas tube deeper into the receiver, index and install the block, then slide the tube out into the gas block and pin it. Will it work?
Upper assembly order - Old Bob - 07-17-2020
Yup, you can do that. I've replaced gas tubes without removing the gas block.
Upper assembly order - redhat - 07-17-2020
Yes, thats how I do it on barrels that come with a front sight block installed. No pint in removing it if you dont have to.