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I know that they are possible to do with a drill press, but they are dead simple with even the cheapest of mills and a jig. I have read great things about Tactical Machining in Florida ...
One thing to keep in mind is that you will want to finish the lower with something ... hard anodize is the norm and that usually runs $75-$100 per batch ... so it really pays to do a bunch of them with friends. Another thing is that you will need a couple of long end mills ... again, good to split with friends.
Saands
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