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I am working on assembling everything to start making some 80% AR Lowers. I am doing most of mine as raw aluminum and then I will get them hard anodized.
My question has to do with the hole sizes, especially for the fire control group.
For the trigger and hammer pins, the blueprints that I have seen call for a hole that is .1560 with a tolerance of .0015. But, hard anodizing will add a little material, around .0015 based on my reading.
Do I need to drill the hole out to .157 or .158 to allow for that? I don't want to get it hard anodized then have to remove the anodizing to make the pins fit and I don't want it sloppy.
Or, is that the dimension that allows the anodizing to close up the hole a little?
My question has to do with the hole sizes, especially for the fire control group.
For the trigger and hammer pins, the blueprints that I have seen call for a hole that is .1560 with a tolerance of .0015. But, hard anodizing will add a little material, around .0015 based on my reading.
Do I need to drill the hole out to .157 or .158 to allow for that? I don't want to get it hard anodized then have to remove the anodizing to make the pins fit and I don't want it sloppy.
Or, is that the dimension that allows the anodizing to close up the hole a little?
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