I've used them and they do work in certain applications. I don't know if it is a gator brand. However, as far as gun work goes, I think they might be more effective on long guns or something with a greater surface area.
I find better results in handgun work such as tapping or drilling by using a few simple rules:
1.take your time
2.accurate measuring tools
3.quality bits,taps,fluid and in every case, a center punch,preferably spring loaded
4.take your time
5.drill press and vises when possible for precision and allows you to choke up on those super thin cutters.
6.take your time
The guides definitely work if it fits your work space or gun contours. Anyone who does a fair amount of drilling or tapping in metal should have one as they are not that expensive.
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