I need to install a low profile gas block. It seems most come with set screws. Is there a standard depth the barrel should be drilled to? I assume the dimples should be ever so slightly larger than the set screw. Any tricks for lining up the gas port?
You will want the dimples in the barrel to be smaller than the screws so the tip of the screw will engage the dimple and keep the whole affair tight. If the dimples are oversized then the screws may not keep it tight. As far as indexing the hole, mark the top of the barrel where you will be able to see it with the gas block in position. Then line up the gas block as needed with your index mark. Ken
Answer
Make pencil line on barrel in-line with gas port. Index gas block with line. Point up screw that fits set screw holes. Screw in to mark center point of dimples. Use a sharp drill slightly larger in diameter than the screws. Only drill deep enough to make the dimple slightly smaller in diameter than the screws. The bevel on the screws will then center in the dimple. Jack
