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AR-15 Gas Port/Block Alignment Pin
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This aligns the gas port of the barrel with the port in the gas block.
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Print with the smallest nozzle and layer height possible with a brim. It's a pain to remove the brim, but it fails without it. I use scarf joints on the seams.
The diameter of the gas port on the barrel I was using this for was ~1.8mm, but port sizes vary depending on your barrel so you may need to resize it.
For instructions on how to use it here is a video: