Last one on block install, is axial rotation indexing of the block gas passage to barrel gas port, and the quick way to determine that one, is to mark the barrel shoulder with pencil at TDC of gas port, and use the center line of the gas tube to get that alignment correct as well.Īs for gas tube to the carrier key, that too has to be aligned. Hence some gas block gas passages are location off the barrel shoulder for a front hand guard clip to be installed between them, while other times, gas block passage is located for the block to be tight against the shoulder instead. Most of the time if the gas block is the correct size for the barrel gas section in play (there are different sizes), its a matter of a bur at the gas port barrel surface that is not allowing the block to make a good seal to the barrel at gas port, or the barrel gas port location off the barrel shoulder slightly different, and block has to be pulled off the shoulder slightly to get the block gas passage to align to the block passage correctly.
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