I just ordered a Kaw Valley "Dimpling Jig" . I have some uppers that were not dimpled and the Kaw Valley will work for all of them plus the new one I am gonna put together myself... https://www.kawvalleyprecision.com/KVP-A...g-.750.htm Check out this tool, I am hoping it will work well.. it has holes for 3 different screw spacings. 0.400, 0.420 and 0.450. The Odin Adjustable gas block I got on sale has 0.450 inch center to center set screw spacing. Maybe your barrel was drilled for a different screw spacing than your gas block? With the KAW Valley tool you can put the alignment screw into the gas port and see if the set screws are drilled in the right spot.
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Build Help - Cycling Issue
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