05-27-2020, 05:23 PM
For gas block alignment, I've used the Spaghetti trick for my last few builds. It's pretty hard to mess up.
Put a piece of spaghetti in your gas port and break it off flush with the barrel shoulder. Slide the gas block on, with the port up. Once you think you've got your port aligned, roll the barrel over, allowing the spaghetti to slide into the gas block's hole. You should wiggle the gas block in all directions to get a feel for where the hole centers are, then snug the set screws, pins, etc. Loktite one screw at a time, leaving the other tight enough to hold the block in place while you remove the other screw. Then put 15in lbs on the first, followed by the second. On my BCM gas blocks I tighten both screws to 25in lbs. After the screws are tight, roll the barrel back over port up, and use a cleaning rod to break the pasta off and push from the barrel. Easy as 1-2-3.
The pencil line was my old method, but that left me always feeling some apprehension about whether I had it forward of the shoulder enough, or whether this gas block was supposed to be touching the shoulder... etc.
Put a piece of spaghetti in your gas port and break it off flush with the barrel shoulder. Slide the gas block on, with the port up. Once you think you've got your port aligned, roll the barrel over, allowing the spaghetti to slide into the gas block's hole. You should wiggle the gas block in all directions to get a feel for where the hole centers are, then snug the set screws, pins, etc. Loktite one screw at a time, leaving the other tight enough to hold the block in place while you remove the other screw. Then put 15in lbs on the first, followed by the second. On my BCM gas blocks I tighten both screws to 25in lbs. After the screws are tight, roll the barrel back over port up, and use a cleaning rod to break the pasta off and push from the barrel. Easy as 1-2-3.
The pencil line was my old method, but that left me always feeling some apprehension about whether I had it forward of the shoulder enough, or whether this gas block was supposed to be touching the shoulder... etc.
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