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Aligning the gas block on and AR15
I'm planning to change the gas block on my AR to a "low profile". It currently has a steel picatinny block, but I don't need it for anything. I'll swap that block to my 22LR upper and mount a folding sight on it.
How do I get the low profile block in the right position to align with the gas port on the barrel? I used a torpedo level on the rail-type block, but there's no way to put a level on the low profile. Any suggestions?
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